Body, nutrition and health calculators — BMI, calories, body fat and daily targets.
Body, nutrition and health calculators — BMI, calories, body fat and daily targets.
BMI Calculator
Work out your Body Mass Index — then go further, with your healthy weight range, BMR, daily calorie targets for your goal, body fat % and ideal weight.
Open BMI Calculator →Calorie Calculator
Your daily calories for losing, maintaining or gaining weight — from BMR and activity level, with macros and a weekly plan.
Open Calorie Calculator →TDEE Calculator
Your total daily energy expenditure — BMR times activity level, with calorie targets for losing, maintaining or gaining weight.
Open TDEE Calculator →Ovulation Calculator
Predict your fertile window and ovulation day from your cycle — with next 3 cycles shown.
Open Ovulation Calculator →Pregnancy Calculator
Your due date, current week and trimester from your last period — with milestones along the way.
Open Pregnancy Calculator →Height Calculator
Convert height between cm, metres, feet+inches and inches — plus predicted adult height from parents' heights.
Open Height Calculator →BMR Calculator
Your basal metabolic rate — Mifflin-St Jeor, Harris-Benedict and Katch-McArdle, compared side by side.
Open BMR Calculator →Body Fat Calculator
Body fat percentage — US Navy method with BMI fallback, plus category and guidance.
Open Body Fat Calculator →Body Type Calculator
Estimate your body type and frame size from a few simple measurements.
Open Body Type Calculator →BAC Calculator
Estimate blood alcohol concentration (Widmark) and time until sober.
Open BAC Calculator →Heart Rate Zone Calculator
Find your five heart-rate training zones from age and resting heart rate, using Karvonen and max-HR methods.
Open Heart Rate Zone Calculator →Body Shape Calculator
Estimate your body shape from bust, waist and hip measurements, with waist-to-hip and waist-to-height ratios.
Open Body Shape Calculator →Pregnancy Week Calculator
Find your current pregnancy week, trimester and estimated due date from the first day of your last period.
Open Pregnancy Week Calculator →Ejection Fraction Calculator
Calculate ejection fraction from end-diastolic and end-systolic volumes, with stroke volume, cardiac output and an interpretation band — an estimate, not medical advice.
Open Ejection Fraction Calculator →Steps to Miles Converter
Turn your step count into miles and kilometres — with a stride length estimated from your height, or your own measured stride.
Open Steps to Miles Converter →Weight Loss By Date Calculator
Pick a target weight and a target date, and find the weekly loss rate and daily calorie deficit it requires — with a clear warning when the pace is too fast.
Open Weight Loss By Date Calculator →How Much Water Calculator
Estimate how much water to drink a day from your weight, activity, climate and exercise — in litres, glasses and bottles.
Open How Much Water Calculator →Alcohol Elimination Calculator
Widmark estimate of BAC and time until alcohol leaves your system — estimate only, never a fitness-to-drive guarantee.
Open Alcohol Elimination Calculator →Weight Gain Calculator
Estimate the daily calories you need to gain weight steadily, from your maintenance calories plus a safe weekly surplus.
Open Weight Gain Calculator →Puppy Weight Calculator
Estimate your puppy's adult weight from its current weight, age and breed size — with the range to expect, not just one number.
Open Puppy Weight Calculator →Lean Body Mass Calculator
Estimate lean body mass with the Boer, James and Hume formulas, plus implied body fat.
Open Lean Body Mass Calculator →Dosage Calculator
Work out weight-based doses in mg per dose and per day, with optional liquid volume and maximum-dose checks.
Open Dosage Calculator →Mean Arterial Pressure Calculator
Mean arterial pressure from systolic and diastolic readings, with pulse pressure alongside.
Open Mean Arterial Pressure Calculator →INR Calculator
Calculate INR from prothrombin time and ISI — a lab value to discuss with your clinician, never a self-dosing tool.
Open INR Calculator →Walking Calorie Calculator
Estimate walking calories from weight, distance or steps, and pace, using MET values — an estimate, not a measurement.
Open Walking Calorie Calculator →Weight Loss Percentage Calculator
Turn start and current weight into a percentage lost, plus what remains to reach your goal.
Open Weight Loss Percentage Calculator →BUN Creatinine Ratio Calculator
Divide BUN by creatinine for the ratio clinicians use to distinguish patterns of kidney stress — lab value only.
Open BUN Creatinine Ratio Calculator →Dog Pregnancy Calculator
From the mating date, estimate a dog’s due window around the typical 63-day gestation — vet confirmation advised.
Open Dog Pregnancy Calculator →4Ts Score Calculator
Score heparin-induced thrombocytopenia (HIT) risk with the published 4Ts system — thrombocytopenia, timing, thrombosis and other causes — with an interpretation band.
Open 4Ts Score Calculator →5/3/1 Lifting Calculator
Jim Wendler 5/3/1 training weights: enter a one-rep max and get all four weeks — 5s, 3s, 5/3/1 and deload — from a 90% training max.
Open 5/3/1 Lifting Calculator →6-Minute Walk Test Calculator
Predict 6-minute walk distance from the published Enright reference equations, compare your actual distance, and see the percentage of predicted with interpretation bands.
Open 6-Minute Walk Test Calculator →A Body Shape Index (ABSI) Calculator
Compute your A Body Shape Index from waist, height and weight, with BMI and an interpretation of where your ABSI sits.
Open A Body Shape Index (ABSI) Calculator →Absolute Eosinophil Count Calculator
Convert a white cell count and eosinophil percentage into an absolute eosinophil count, with standard interpretation bands.
Open Absolute Eosinophil Count Calculator →Absolute Lymphocyte Count Calculator
Convert a white cell count and lymphocyte percentage into an absolute lymphocyte count, with standard adult bands.
Open Absolute Lymphocyte Count Calculator →Absolute Neutrophil Count (ANC) Calculator
Compute the absolute neutrophil count from WBC, segmented neutrophils and bands, with standard neutropenia bands.
Open Absolute Neutrophil Count (ANC) Calculator →Acetaminophen Dosage Calculator
Work out standard adult and weight-based paediatric acetaminophen (paracetamol) doses from published dosing ranges.
Open Acetaminophen Dosage Calculator →Acetaminophen Overdose Calculator
Plot a serum acetaminophen level on the revised Rumack–Matthew nomogram treatment line — with urgent safety guidance.
Open Acetaminophen Overdose Calculator →Acid-Base (ABG) Calculator
Interpret an arterial blood gas: calculated pH, anion gap, Winter’s formula compensation check, and primary disorder.
Open Acid-Base (ABG) Calculator →Adderall Dosage Calculator
Check published Adderall / Adderall XR starting doses and daily maximums by age, form and indication — with a dose-limit check.
Open Adderall Dosage Calculator →Adjusted Age Calculator (Premature Babies)
Convert a premature baby’s chronological age into adjusted (corrected) age from gestational age at birth.
Open Adjusted Age Calculator (Premature Babies) →Adjusted Body Weight Calculator
Compute ideal body weight (Devine) and adjusted body weight for drug dosing in patients above ideal weight.
Open Adjusted Body Weight Calculator →Adrenal Washout Calculator
Compute absolute and relative adrenal washout from CT attenuation values and check them against adenoma thresholds.
Open Adrenal Washout Calculator →Age-Adjusted D-Dimer Calculator
Find the age-adjusted D-dimer cut-off for patients over 50 and compare a result against it, with the standard 500 cut-off under 50.
Open Age-Adjusted D-Dimer Calculator →Albumin-Globulin Ratio Calculator
Compute the albumin/globulin ratio from albumin and total protein, with the usual reference band.
Open Albumin-Globulin Ratio Calculator →Alcohol Units Calculator
Convert a drink’s volume and strength into UK alcohol units, US standard drinks and grams of pure alcohol.
Open Alcohol Units Calculator →Aldrete Score Calculator
Score post-anaesthesia recovery with the modified Aldrete score across activity, respiration, circulation, consciousness and oxygen saturation.
Open Aldrete Score Calculator →Aleve (Naproxen) Dosage Calculator
Check the over-the-counter naproxen (Aleve) regimen and how much of the daily maximum remains after tablets already taken.
Open Aleve (Naproxen) Dosage Calculator →Alvarado Score Calculator
Score suspected appendicitis with the Alvarado (MANTRELS) score and see the standard probability bands.
Open Alvarado Score Calculator →Alveolar-Arterial Gradient Calculator
Compute the alveolar–arterial oxygen gradient from FiO2, PaCO2 and PaO2, with an age-based expected value.
Open Alveolar-Arterial Gradient Calculator →Alzheimer’s Life Expectancy Calculator
Look up published median survival after a mild-to-moderate Alzheimer’s diagnosis by sex, age group and comorbidity count — a population statistic, not a personal prognosis.
Open Alzheimer’s Life Expectancy Calculator →Amoxicillin Pediatric Dosage Calculator
Compute published paediatric amoxicillin daily and per-dose ranges from a child’s weight, for standard and high-dose regimens.
Open Amoxicillin Pediatric Dosage Calculator →Anaerobic Threshold Calculator
Estimate your anaerobic (lactate) threshold heart-rate zone from age, resting heart rate and training level — an estimate, not a lab test.
Open Anaerobic Threshold Calculator →Anion Gap Calculator
Compute the serum anion gap, with albumin correction, and see whether it falls in the normal range.
Open Anion Gap Calculator →Ankle-Brachial Index Calculator
Compute left and right ankle-brachial indices from arm and ankle pressures, with published peripheral artery disease bands.
Open Ankle-Brachial Index Calculator →APACHE II Score Calculator
Calculate the APACHE II severity score from admission physiology, age and chronic health — with an approximate mortality band for context.
Open APACHE II Score Calculator →Ape Index Calculator
Work out your ape index — wingspan divided by height — and see how your reach compares with the typical 1.0 ratio for climbers and athletes.
Open Ape Index Calculator →Apgar Score Calculator
Score the five Apgar signs at 1 and 5 minutes — appearance, pulse, grimace, activity and respiration — each 0 to 2, for a total out of 10.
Open Apgar Score Calculator →Apnea-Hypopnea Index (AHI) Calculator
Turn a sleep study into an AHI: total apneas plus hypopneas divided by hours of sleep, with the standard mild, moderate and severe bands.
Open Apnea-Hypopnea Index (AHI) Calculator →APRI Score Calculator
Calculate the APRI liver fibrosis score from AST and platelet count — a simple, published blood-test ratio used alongside clinical assessment.
Open APRI Score Calculator →Archery Draw Length Calculator
Estimate your archery draw length from wingspan — the standard wingspan divided by 2.5 rule — plus a suggested arrow length.
Open Archery Draw Length Calculator →AST-ALT Ratio Calculator
Calculate the AST/ALT (De Ritis) ratio from liver blood tests and see the classic interpretation bands — with the caveats that matter.
Open AST-ALT Ratio Calculator →AUDIT Alcohol Screening Calculator
Score the WHO AUDIT questionnaire — 10 questions, 0 to 40 — with the standard low-risk, hazardous, harmful and possible-dependence bands.
Open AUDIT Alcohol Screening Calculator →Average Triathlon Finish Time Calculator
Build your predicted triathlon finish time from your swim, bike and run paces plus transitions — and compare it with typical mid-pack finish times.
Open Average Triathlon Finish Time Calculator →Baby Eye Color Predictor
Estimate a baby’s likely eye colour from the parents’ eye colours and whether each parent has a blue-eyed parent — as probabilities, never a certainty.
Open Baby Eye Color Predictor →Baby Formula Calculator
Work out how much formula your baby needs per day and per feed from weight and feeds per day — using the standard weight-based guide.
Open Baby Formula Calculator →Baby Milk Intake Calculator
Estimate how much milk your baby needs per day and per feed from weight and age — for breast milk, formula, or mixed feeding.
Open Baby Milk Intake Calculator →Barthel Index Calculator
Score the 10-item Barthel Index of daily living activities — feeding, bathing, dressing, mobility and more — for a total out of 100.
Open Barthel Index Calculator →BASDAI Score Calculator
Score the Bath Ankylosing Spondylitis Disease Activity Index — six 0-to-10 questions on fatigue, pain, stiffness and more.
Open BASDAI Score Calculator →Beighton Score Calculator
Score the 9-point Beighton scale for joint hypermobility — little fingers, thumbs, elbows, knees and trunk flexion, left and right.
Open Beighton Score Calculator →Benadryl Dosage Calculator
Check the published diphenhydramine (Benadryl) dose range by age and weight — single-dose and daily-maximum guidance, with the under-2 warning.
Open Benadryl Dosage Calculator →Bench Press Calculator
Estimate your bench press one-rep max from a submaximal set — Epley, Brzycki and Lander formulas — plus training loads at 60–90% of 1RM.
Open Bench Press Calculator →Benzodiazepine Conversion Calculator
Convert between benzodiazepines using published diazepam-equivalent doses (Ashton) — with the clear warning that equivalents are approximate.
Open Benzodiazepine Conversion Calculator →Berg Balance Scale Calculator
Score the 14-item Berg Balance Scale — sitting, standing, reaching, turning and stepping — each 0 to 4, for a total out of 56.
Open Berg Balance Scale Calculator →Bicarbonate Deficit Calculator
Estimate the bicarbonate deficit in metabolic acidosis from serum bicarbonate, body weight and target — plus the equivalent volume of 8.4% solution.
Open Bicarbonate Deficit Calculator →Bike Cadence Calculator
Convert between cycling cadence and speed from chainring, cog and wheel size — or work out the gear ratio and distance per pedal revolution.
Open Bike Cadence Calculator →Birth Control Cost Calculator
Compare the true cost of birth control over time — upfront plus monthly costs, insurance cover, and cost per year for your chosen method.
Open Birth Control Cost Calculator →Bishop Score Calculator
Score the five Bishop components for induction readiness — dilation, effacement, station, consistency and position — for a total out of 13.
Open Bishop Score Calculator →Bladder Volume Calculator
Estimate bladder volume from ultrasound length, width and height, with post-void residual interpretation.
Open Bladder Volume Calculator →Blood Donation Eligibility Calculator
Check general blood donation eligibility by age, weight, donation interval and haemoglobin, with the wait until the next donation.
Open Blood Donation Eligibility Calculator →Blood Loss Calculator
Estimate blood volume, allowable blood loss from haemoglobin change, and the percentage lost with its shock class.
Open Blood Loss Calculator →Blood pH Calculator
Calculate blood pH from bicarbonate and carbon dioxide with the Henderson-Hasselbalch equation, plus acid-base interpretation and optional anion gap.
Open Blood pH Calculator →Blood Pressure Calculator
Classify blood pressure, and calculate mean arterial pressure and pulse pressure, from systolic and diastolic readings.
Open Blood Pressure Calculator →Blood Sugar Calculator
Convert blood glucose between mg/dL and mmol/L, classify fasting, random and post-meal readings, and estimate average glucose from HbA1c.
Open Blood Sugar Calculator →Blood Volume Calculator
Estimate total blood volume with the Nadler formula, alongside the simple weight-based estimate, from sex, height and weight.
Open Blood Volume Calculator →BODE Index Calculator
Score COPD severity with the published BODE index from BMI, lung function, breathlessness and walk distance, with its prognostic quartile.
Open BODE Index Calculator →Body Adiposity Index (BAI) Calculator
Estimate body fat percentage with the Body Adiposity Index from hip circumference and height, without needing weight.
Open Body Adiposity Index (BAI) Calculator →Body Frame Size Calculator
Determine small, medium or large body frame from height and wrist circumference, which refines healthy weight ranges.
Open Body Frame Size Calculator →Body Roundness Index (BRI) Calculator
Calculate the Body Roundness Index from waist and height, a shape-based complement to BMI that reflects central fat.
Open Body Roundness Index (BRI) Calculator →Body Surface Area (BSA) Calculator
Calculate body surface area with the Mosteller, Du Bois and Haycock formulas from height and weight.
Open Body Surface Area (BSA) Calculator →Body Water Percentage Calculator
Estimate total body water and body water percentage with the Watson formula from age, sex, height and weight.
Open Body Water Percentage Calculator →Braden Scale Calculator
Score pressure injury risk with the published Braden Scale across sensory perception, moisture, activity, mobility, nutrition and friction.
Open Braden Scale Calculator →Breast Cancer Recurrence Risk Calculator
Estimate breast cancer prognostic group with the published Nottingham Prognostic Index from tumour size, grade and nodal involvement.
Open Breast Cancer Recurrence Risk Calculator →Breast Pump Flange Size Calculator
Find the right breast pump flange size from nipple diameter, using the standard 2-4 mm clearance guide and common flange sizes.
Open Breast Pump Flange Size Calculator →Breastfeeding Calorie Calculator
Estimate daily calorie needs while breastfeeding from basal metabolic rate, activity level and lactation stage.
Open Breastfeeding Calorie Calculator →Brief Interview for Mental Status (BIMS) Calculator
Score the Brief Interview for Mental Status from word repetition, temporal orientation and recall, with its published bands.
Open Brief Interview for Mental Status (BIMS) Calculator →Bruce Protocol METs Calculator
Estimate VO2 max and METs from Bruce treadmill test time with the published Pollock equations, plus an age-predicted maximum heart rate.
Open Bruce Protocol METs Calculator →Caffeine Intake Calculator
Add up daily caffeine from coffee, tea, cola and energy drinks, and compare it with the 400 mg adult guideline or the 200 mg pregnancy guideline.
Open Caffeine Intake Calculator →CAGE Questionnaire Calculator
Score the four-question CAGE alcohol screen, where two or more yes answers indicate a positive screen needing fuller assessment.
Open CAGE Questionnaire Calculator →Carboplatin Dose Calculator
Calculate carboplatin dose with the Calvert formula from target AUC and kidney function, with capped GFR and creatinine-clearance method choice.
Open Carboplatin Dose Calculator →Cardiac Output Calculator
Calculate cardiac output from heart rate and stroke volume, with ejection fraction and cardiac index when end-diastolic volume and body size are given.
Open Cardiac Output Calculator →Cefdinir Dosage Calculator
Calculate labelled cefdinir dosing for adults and children from age group, weight, indication and kidney function, with caps and renal reductions.
Open Cefdinir Dosage Calculator →Centor Score Calculator
Estimate strep throat likelihood with the classic Centor criteria — fever, exudate, tender nodes and no cough — in seconds.
Open Centor Score Calculator →Cerebral Perfusion Pressure Calculator
Calculate cerebral perfusion pressure from blood pressure and intracranial pressure, with the usual 60-70 mmHg target range.
Open Cerebral Perfusion Pressure Calculator →CHA2DS2-VASc Score Calculator
Score stroke risk in atrial fibrillation with the published CHA2DS2-VASc table, including annual risk estimates.
Open CHA2DS2-VASc Score Calculator →Charlson Comorbidity Index Calculator
Combine age and 17 comorbidity groups into the Charlson index, with an estimated 10-year survival figure.
Open Charlson Comorbidity Index Calculator →Child BMI Percentile Calculator
Work out a child’s BMI percentile for ages 2-20, with CDC-style weight categories explained in plain language.
Open Child BMI Percentile Calculator →Child Growth Percentile Calculator
Estimate height and weight percentiles for children up to 18, with plain-language guidance on what a percentile does and does not mean.
Open Child Growth Percentile Calculator →Child-Pugh Score Calculator
Score liver cirrhosis severity with the published Child-Pugh table, including class and survival estimates.
Open Child-Pugh Score Calculator →Cholesterol Ratio Calculator
Turn total, HDL and LDL cholesterol into total/HDL and LDL/HDL ratios plus non-HDL cholesterol, in mg/dL or mmol/L.
Open Cholesterol Ratio Calculator →Circadian Rhythm Calculator
Plan bedtime, wake time, light, exercise and caffeine cut-off around your natural circadian rhythm.
Open Circadian Rhythm Calculator →CIWA-Ar Alcohol Withdrawal Calculator
Score alcohol withdrawal severity with the 10-item CIWA-Ar scale, from minimal to severe.
Open CIWA-Ar Alcohol Withdrawal Calculator →Conception Date Calculator
Estimate a conception date from the last menstrual period or a due date, with the fertile window around ovulation.
Open Conception Date Calculator →Corrected Calcium Calculator
Adjust total calcium for albumin with the Payne formula, in mg/dL or mmol/L, with albumin in g/dL or g/L.
Open Corrected Calcium Calculator →Corrected Magnesium Calculator
Adjust total magnesium for albumin with the Kroll and Elin formula, in mg/dL or mmol/L.
Open Corrected Magnesium Calculator →Creatinine Clearance Calculator
Estimate kidney function with Cockcroft-Gault creatinine clearance and the 2021 CKD-EPI eGFR, with unit handling.
Open Creatinine Clearance Calculator →Crohn’s Disease Activity Index Calculator
Score Crohn’s disease activity with the classic Best CDAI weights, from remission to severe disease.
Open Crohn’s Disease Activity Index Calculator →Crown-Rump Length Calculator
Convert crown-rump length to gestational age, or gestational age to expected CRL, with an estimated due date.
Open Crown-Rump Length Calculator →CURB-65 Score Calculator
Score community-acquired pneumonia severity with CURB-65, including 30-day mortality estimates and care setting.
Open CURB-65 Score Calculator →Cycling Breakaway Calculator
Work out whether a breakaway survives: catch time, catch distance and time to the finish at constant speeds.
Open Cycling Breakaway Calculator →Cycling Life Gain Calculator
Estimate the life-time gained from regular cycling, using the Utrecht finding that each hour ridden returns about an hour of life.
Open Cycling Life Gain Calculator →Cycling Power Calculator
Estimate cycling power from speed, weight, gradient and wind using standard cycling physics, plus watts per kilo.
Open Cycling Power Calculator →Cycling Training Zones Calculator
Turn functional threshold power (FTP) into Coggan-style power training zones, with watts per kilo.
Open Cycling Training Zones Calculator →Daily Sugar Intake Calculator
Compare your added sugar intake with WHO and American Heart Association limits, in grams and teaspoons.
Open Daily Sugar Intake Calculator →DAPT Score Calculator
Score the benefit of prolonging dual antiplatelet therapy after coronary stenting, using the published DAPT score.
Open DAPT Score Calculator →Dead Space Calculator
Calculate physiological dead space with the Bohr equation, plus dead-space volume and alveolar ventilation.
Open Dead Space Calculator →Denver HIV Risk Score Calculator
Estimate the likelihood of undiagnosed HIV infection with the published Denver HIV Risk Score, with a testing threshold at 30.
Open Denver HIV Risk Score Calculator →Diabetes Risk Calculator
Estimate 10-year type 2 diabetes risk with the published FINDRISC questionnaire, including age, BMI, waist, activity and family history.
Open Diabetes Risk Calculator →Diabetic Ketoacidosis Calculator
Check DKA severity from pH and bicarbonate and estimate corrected sodium, effective osmolality and water deficit for education.
Open Diabetic Ketoacidosis Calculator →Diaper Usage Calculator
Estimate how many diapers a baby uses per day, month and year, plus the cost, from age-based averages or your own daily count.
Open Diaper Usage Calculator →DIC Score Calculator
Score overt disseminated intravascular coagulation with the ISTH algorithm from platelets, D-dimer, prothrombin time and fibrinogen.
Open DIC Score Calculator →Diet Risk Score Calculator
Score overall dietary pattern from fruit and vegetables, whole grains, sugary drinks, processed meat, fish and cooking habits.
Open Diet Risk Score Calculator →Diffuse Large B-Cell Lymphoma Prognosis Calculator
Estimate the International Prognostic Index (IPI) for diffuse large B-cell lymphoma from age, stage, LDH, performance status and extranodal sites.
Open Diffuse Large B-Cell Lymphoma Prognosis Calculator →Dog Walking Benefits Calculator
Estimate calories burned, steps, distance and weekly activity from your dog walks, including the health activity target.
Open Dog Walking Benefits Calculator →Drug Half-Life Calculator
Work out how much of a single dose remains after a given time, and how long until it falls to a target percentage.
Open Drug Half-Life Calculator →DUDIT Drug Use Screening Calculator
Score the 11-item Drug Use Disorders Identification Test (DUDIT) and see whether the result reaches the published screening cut-offs.
Open DUDIT Drug Use Screening Calculator →Duke Activity Status Index Calculator
Score the 12-item Duke Activity Status Index (DASI) and estimate peak oxygen uptake and functional capacity in METs.
Open Duke Activity Status Index Calculator →Duke Treadmill Score Calculator
Calculate the Duke Treadmill Score from exercise time, ST-segment deviation and angina, with its published risk groups.
Open Duke Treadmill Score Calculator →EASI Score Calculator
Score eczema severity with the Eczema Area and Severity Index (EASI) across the head, trunk, upper and lower limbs.
Open EASI Score Calculator →ECG Heart Rate Calculator
Convert an ECG RR interval or small-square count into heart rate, and correct the QT interval with Bazett’s formula.
Open ECG Heart Rate Calculator →Edinburgh Postnatal Depression Scale (EPDS) Calculator
Score the 10-item Edinburgh Postnatal Depression Scale (EPDS) used to screen for postnatal depression, with its published thresholds.
Open Edinburgh Postnatal Depression Scale (EPDS) Calculator →Effective Regurgitant Orifice Area (EROA) Calculator
Calculate effective regurgitant orifice area and regurgitant volume from the PISA method for mitral regurgitation.
Open Effective Regurgitant Orifice Area (EROA) Calculator →Egg Freezing Calculator
Model how many frozen eggs translate into expected embryos and the chance of at least one live birth, with adjustable assumptions.
Open Egg Freezing Calculator →Endotracheal Tube Size Calculator
Estimate endotracheal tube size and oral insertion depth for children by age, and typical adult sizes by sex.
Open Endotracheal Tube Size Calculator →EORTC Bladder Cancer Prognosis Calculator
Score recurrence and progression risk for non-muscle-invasive bladder cancer with the published EORTC risk tables.
Open EORTC Bladder Cancer Prognosis Calculator →Epworth Sleepiness Scale Calculator
Score daytime sleepiness with the 8-item Epworth Sleepiness Scale and see the published severity bands.
Open Epworth Sleepiness Scale Calculator →Estimated Energy Requirement (EER) Calculator
Estimate daily energy needs for adults with the Institute of Medicine EER equations, adjusted for activity and weight goal.
Open Estimated Energy Requirement (EER) Calculator →EtG Alcohol Test Calculator
Estimate how long ethyl glucuronide (EtG) may remain detectable after drinking, with honest uncertainty ranges — never a pass or fail promise.
Open EtG Alcohol Test Calculator →Exclusive Pumping Calculator
Plan exclusive pumping: daily milk needs, output per session, surplus or shortfall, and how long a freezer stash lasts.
Open Exclusive Pumping Calculator →Fagerstrom Nicotine Dependence Test Calculator
Score nicotine dependence with the 6-item Fagerstrom Test for Nicotine Dependence (FTND) and its published bands.
Open Fagerstrom Nicotine Dependence Test Calculator →Fatigue Severity Scale Calculator
Score fatigue impact with the 9-item Fatigue Severity Scale (FSS), reporting the mean score and total.
Open Fatigue Severity Scale Calculator →Fertility by Age Calculator
See how typical conception chances and miscarriage risk change with age, using published population averages.
Open Fertility by Age Calculator →FEV1/FVC Ratio Calculator
Calculate the FEV1/FVC ratio from spirometry and see whether the pattern suggests airflow obstruction.
Open FEV1/FVC Ratio Calculator →FIB-4 Score Calculator
Calculate the FIB-4 index from age, AST, ALT and platelets to stratify liver fibrosis risk.
Open FIB-4 Score Calculator →Finnegan NAS Score Calculator
Score neonatal abstinence syndrome with the classic 21-item Finnegan scale and its usual treatment thresholds.
Open Finnegan NAS Score Calculator →Fish Oil Dosage Calculator
Work out how many fish oil capsules a day give a published EPA plus DHA target for general health or triglyceride support.
Open Fish Oil Dosage Calculator →Flight Radiation Calculator
Estimate the cosmic radiation dose of a flight from its duration and route latitude, with everyday comparisons.
Open Flight Radiation Calculator →Fractional Excretion of Sodium Calculator
Calculate fractional excretion of sodium (FeNa) to help separate prerenal injury from acute tubular necrosis.
Open Fractional Excretion of Sodium Calculator →Fractional Excretion of Urea Calculator
Calculate fractional excretion of urea (FeUrea), the prerenal marker that stays useful when diuretics distort FeNa.
Open Fractional Excretion of Urea Calculator →Frailty Index Calculator
Build a 20-item deficit-accumulation frailty index and see the robust, pre-frail and frail bands.
Open Frailty Index Calculator →Framingham Risk Score Calculator
Estimate 10-year general cardiovascular risk with the Framingham (D’Agostino 2008) points system.
Open Framingham Risk Score Calculator →Free Testosterone Calculator
Calculate free testosterone from total testosterone, SHBG and albumin with the Vermeulen equation.
Open Free Testosterone Calculator →Free Water Deficit Calculator
Calculate the free water deficit in hypernatraemia from body weight, sex, age group and serum sodium.
Open Free Water Deficit Calculator →Fresh Frozen Plasma Dose Calculator
Work out a fresh frozen plasma dose in millilitres and approximate units from body weight and the usual mL/kg range.
Open Fresh Frozen Plasma Dose Calculator →Fundal Height Calculator
Compare a measured symphysis-fundal height with the expected height for gestational age.
Open Fundal Height Calculator →Gabapentin Dosage Calculator
Check the published gabapentin daily dose range by kidney function, with per-dose splits for divided dosing.
Open Gabapentin Dosage Calculator →GAD-7 Anxiety Calculator
Score the 7-item GAD-7 anxiety questionnaire over the last two weeks and see the standard severity bands.
Open GAD-7 Anxiety Calculator →Gastric Sleeve Weight Loss Calculator
Calculate percent total and percent excess weight loss after gastric sleeve surgery from pre-op and current weight.
Open Gastric Sleeve Weight Loss Calculator →Glasgow Coma Scale Calculator
Score the Glasgow Coma Scale from eye, verbal and motor responses and see the mild, moderate and severe bands.
Open Glasgow Coma Scale Calculator →Glucose Infusion Rate Calculator
Convert between dextrose infusion rate and glucose infusion rate (mg/kg/min) for IV dextrose infusions.
Open Glucose Infusion Rate Calculator →Glycemic Load Calculator
Calculate glycemic load from a food’s glycemic index and carbohydrate content, with an optional second food for a meal total.
Open Glycemic Load Calculator →Gorlin Formula Calculator
Calculate aortic or mitral valve area with the Gorlin formula from cardiac output, mean gradient and ejection or filling time.
Open Gorlin Formula Calculator →Gout Diagnosis Calculator
Apply the 2015 ACR/EULAR gout classification criteria: enter the clinical, laboratory and imaging features and score against the threshold of 8.
Open Gout Diagnosis Calculator →GRACE Score Calculator
Calculate the GRACE in-hospital mortality score for acute coronary syndrome from eight admission variables.
Open GRACE Score Calculator →Gut Microbiome Score Calculator
Estimate a transparent gut-health lifestyle score from diet diversity, fibre, fermented foods and other everyday factors.
Open Gut Microbiome Score Calculator →Hair Growth Calculator
Project how long your hair will grow over time from its current length and an average monthly growth rate.
Open Hair Growth Calculator →Hand Sanitizer Dilution Calculator
Dilute a stronger alcohol stock to a target hand-sanitiser strength with the C1V1 = C2V2 dilution equation.
Open Hand Sanitizer Dilution Calculator →Happiness Score Calculator
Turn six quick self-ratings for mood, satisfaction, relationships, purpose, energy and stress into a transparent well-being score.
Open Happiness Score Calculator →HAS-BLED Score Calculator
Score bleeding risk on anticoagulation with the published HAS-BLED items and their published annual bleeding rates.
Open HAS-BLED Score Calculator →hCG Levels Calculator
Work out hCG doubling time and percentage rise between two blood tests, and compare the rise with the expected early-pregnancy pattern.
Open hCG Levels Calculator →Heart Failure Life Expectancy Calculator
See published population survival ranges by heart-failure severity class — population statistics, never a personal prognosis.
Open Heart Failure Life Expectancy Calculator →Heart Rate Recovery Calculator
Measure heart-rate recovery after exercise — the drop from peak heart rate at one and two minutes — and flag abnormal recovery.
Open Heart Rate Recovery Calculator →Height Estimation for Bedridden Patients Calculator
Estimate standing height for bedridden patients from knee height with the published Chumlea equations.
Open Height Estimation for Bedridden Patients Calculator →Hematocrit-Hemoglobin Calculator
Convert between haemoglobin and haematocrit with the rule of three, and work out MCHC when both values are known.
Open Hematocrit-Hemoglobin Calculator →Hemoglobin A1c Calculator
Convert HbA1c to estimated average glucose (eAG) and back, in mg/dL and mmol/L, with the ADAG equation.
Open Hemoglobin A1c Calculator →Hepatic Steatosis Index Calculator
Score fatty-liver likelihood with the published Hepatic Steatosis Index from ALT, AST, BMI, sex and diabetes status.
Open Hepatic Steatosis Index Calculator →Hiking Time Calculator
Estimate hiking time with Naismith’s rule — distance pace plus an hour per 600 metres of ascent — with breaks added.
Open Hiking Time Calculator →Hormone Ratio Calculator
Work out testosterone-to-oestradiol and progesterone-to-oestradiol ratios from lab values, with units converted to match.
Open Hormone Ratio Calculator →Hydroxychloroquine Dose Calculator
Work out the weight-based maximum daily hydroxychloroquine dose for lupus and rheumatoid arthritis, capped at 400 mg.
Open Hydroxychloroquine Dose Calculator →Ibuprofen Dosage Calculator
Check published ibuprofen single doses and daily maxima for adults and weight-based doses for children, from labelling only.
Open Ibuprofen Dosage Calculator →Ideal Body Weight Calculator
Compare ideal body weight from the Devine, Robinson and Hamwi formulas for a given height and sex.
Open Ideal Body Weight Calculator →Implantation Date Calculator
Estimate the implantation window — 6 to 12 days after ovulation or conception — with the most likely day in the middle.
Open Implantation Date Calculator →Incidence Rate Calculator
Calculate incidence rate from new cases and person-time, expressed per 1,000, 10,000 or 100,000 person-years.
Open Incidence Rate Calculator →Injury Severity Score Calculator
Score trauma severity with the Injury Severity Score — the sum of squares of the three worst AIS body-region scores.
Open Injury Severity Score Calculator →Insulin Dosage Calculator
Estimate a starting total daily insulin dose from body weight, with basal–bolus split, carb ratio and correction factor, for clinician review.
Open Insulin Dosage Calculator →Insulin Resistance Calculator
Work out insulin resistance from fasting glucose and insulin with both HOMA-IR and QUICKI, the two standard indices.
Open Insulin Resistance Calculator →Intracerebral Hemorrhage Score Calculator
Score intracerebral haemorrhage severity with the published ICH Score and its 30-day mortality by score.
Open Intracerebral Hemorrhage Score Calculator →IQ Percentile Calculator
Convert an IQ score to its percentile rank on the normal distribution, with the standard classification band.
Open IQ Percentile Calculator →Iron Deficiency Calculator
Estimate total body iron deficit with the Ganzoni formula from weight, haemoglobin and a target haemoglobin.
Open Iron Deficiency Calculator →Isotretinoin Dosage Calculator
Work out a weight-based isotretinoin daily dose and cumulative dose target from published dosing ranges.
Open Isotretinoin Dosage Calculator →IV Drip Rate Calculator
Convert an IV infusion into mL per hour and drops per minute for any standard drop factor.
Open IV Drip Rate Calculator →IVIG Dose Calculator
Calculate total and per-day IV immunoglobulin grams from body weight and a prescribed g/kg regimen.
Open IVIG Dose Calculator →Keto Calculator
Estimate daily calories from the Mifflin-St Jeor equation and split them into keto fat, protein and carbohydrate grams.
Open Keto Calculator →Kidney Failure Risk Calculator
Estimate 2-year and 5-year kidney failure risk with the published 4-variable KFRE from age, sex, eGFR and ACR.
Open Kidney Failure Risk Calculator →Kt/V Dialysis Calculator
Calculate single-pool Kt/V dialysis adequacy with the Daugirdas second-generation formula.
Open Kt/V Dialysis Calculator →Levothyroxine Dosage Calculator
Estimate a weight-based levothyroxine daily dose from the standard 1.6 micrograms/kg/day replacement guide.
Open Levothyroxine Dosage Calculator →Lidocaine Dose Calculator
Find the maximum safe lidocaine dose and volume from weight, epinephrine use and solution strength.
Open Lidocaine Dose Calculator →Light’s Criteria Calculator
Apply Light’s criteria to pleural and serum protein and LDH values to classify an effusion as exudate or transudate.
Open Light’s Criteria Calculator →Lille Score Calculator
Score corticosteroid response in severe alcoholic hepatitis with the published Lille model.
Open Lille Score Calculator →Local Anesthetic Dose Calculator
Compare maximum doses and volumes across lidocaine, bupivacaine, ropivacaine and prilocaine, with or without epinephrine.
Open Local Anesthetic Dose Calculator →LRINEC Score Calculator
Score necrotising fasciitis risk with the published LRINEC laboratory table.
Open LRINEC Score Calculator →Lung Capacity Calculator
Derive inspiratory capacity, vital capacity, functional residual capacity and total lung capacity from measured lung volumes.
Open Lung Capacity Calculator →Lung Nodule Growth Rate Calculator
Calculate lung nodule volume doubling time from two diameter measurements and the time between scans.
Open Lung Nodule Growth Rate Calculator →LV Mass Index Calculator
Calculate left ventricular mass and mass index with the Devereux formula and Du Bois body surface area.
Open LV Mass Index Calculator →Maddrey Discriminant Function Calculator
Score alcoholic hepatitis severity with the Maddrey discriminant function from prothrombin time and bilirubin.
Open Maddrey Discriminant Function Calculator →Mean Airway Pressure Calculator
Calculate mean airway pressure from peak pressure, PEEP and inspiratory and expiratory times.
Open Mean Airway Pressure Calculator →Mean Sac Diameter Calculator
Average three gestational sac diameters and estimate gestational age from the mean sac diameter.
Open Mean Sac Diameter Calculator →Medication Schedule Calculator
Space daily medicine doses evenly from a first-dose time, including the classic 3-times-a-day 8-hour schedule.
Open Medication Schedule Calculator →Melatonin Dosage Calculator
Check published melatonin dose ranges and timing for adults by purpose, with a clear start-low guide.
Open Melatonin Dosage Calculator →MELD Score Calculator
Calculate the classic MELD score for end-stage liver disease from bilirubin, INR, creatinine and dialysis status.
Open MELD Score Calculator →Mentzer Index Calculator
Divide MCV by red cell count to distinguish iron deficiency from thalassemia trait patterns in microcytic anaemia.
Open Mentzer Index Calculator →MET Minutes Per Week Calculator
Turn any activity into weekly MET-minutes and see how it compares with the 600 MET-minutes weekly activity target.
Open MET Minutes Per Week Calculator →Metabolic Syndrome Calculator
Check the five ATP III metabolic syndrome criteria from waist, triglycerides, HDL, blood pressure and fasting glucose.
Open Metabolic Syndrome Calculator →Metastatic Prostate Cancer Prognosis Calculator
Classify metastatic prostate cancer disease volume by the published CHAARTED definition, with population context only.
Open Metastatic Prostate Cancer Prognosis Calculator →MEWS Score Calculator
Score the Modified Early Warning Score from respiratory rate, heart rate, blood pressure, temperature and consciousness.
Open MEWS Score Calculator →Micronutrient Calculator
Compare a daily micronutrient intake with its recommended dietary allowance and check it against the tolerable upper level.
Open Micronutrient Calculator →Middle Cerebral Artery Doppler Calculator
Convert a fetal middle cerebral artery peak systolic velocity into multiples of the median using the Mari formula.
Open Middle Cerebral Artery Doppler Calculator →MIPI Score Calculator
Score the Mantle Cell Lymphoma International Prognostic Index from age, performance status, LDH and white cell count.
Open MIPI Score Calculator →Morphine Milligram Equivalent Calculator
Convert a total daily opioid dose into morphine milligram equivalents per day using the CDC 2022 factors.
Open Morphine Milligram Equivalent Calculator →Morse Fall Scale Calculator
Score the Morse Fall Scale from fall history, diagnoses, walking aid, IV therapy, gait and mental status.
Open Morse Fall Scale Calculator →Mortality Rate Calculator
Work out a crude mortality rate per 1,000 and per 100,000 people from deaths and population size.
Open Mortality Rate Calculator →NAFLD Fibrosis Score Calculator
Score liver fibrosis risk in non-alcoholic fatty liver disease from age, BMI, diabetes, AST, ALT, platelets and albumin.
Open NAFLD Fibrosis Score Calculator →NEDOCS Score Calculator
Score emergency department overcrowding with the NEDOCS formula from patients, beds, admissions and waiting times.
Open NEDOCS Score Calculator →Net Carbs Calculator
Work out net carbs by subtracting fibre and sugar alcohols from total carbohydrates for a food or meal.
Open Net Carbs Calculator →Neutrophil Lymphocyte Ratio Calculator
Divide the neutrophil count by the lymphocyte count to get the neutrophil-to-lymphocyte ratio, a general inflammation marker.
Open Neutrophil Lymphocyte Ratio Calculator →Newborn Hyperbilirubinemia Calculator
Convert a newborn bilirubin level, tally jaundice risk factors and flag urgent-review signs, for education only.
Open Newborn Hyperbilirubinemia Calculator →NIH Stroke Scale Calculator
Score all 15 items of the NIH Stroke Scale and total them into a stroke severity band.
Open NIH Stroke Scale Calculator →Noise Exposure Calculator
Work out OSHA noise dose and time-weighted average from one or two noise exposures in a shift.
Open Noise Exposure Calculator →Nuchal Translucency Calculator
Interpret a first-trimester nuchal translucency measurement with crown-rump length and estimated gestation.
Open Nuchal Translucency Calculator →Number Needed to Treat Calculator
Turn trial event rates into absolute risk reduction, relative risk reduction and the number needed to treat.
Open Number Needed to Treat Calculator →Osteoporosis Risk Score Calculator
Score osteoporosis risk with the OSTA index from age and body weight for postmenopausal women.
Open Osteoporosis Risk Score Calculator →Oxygen Tank Duration Calculator
Estimate how long an oxygen cylinder lasts at a given flow rate from its size and gauge pressure.
Open Oxygen Tank Duration Calculator →Oxygenation Index Calculator
Work out the oxygenation index from inspired oxygen fraction, mean airway pressure and arterial oxygen.
Open Oxygenation Index Calculator →Pack Years Calculator
Turn cigarettes per day and years smoked into pack-years, the standard lifetime smoking exposure measure.
Open Pack Years Calculator →Padua Score Calculator
Score venous thromboembolism risk in hospitalised medical patients with the 11-item Padua Prediction Score.
Open Padua Score Calculator →PaO2/FiO2 Ratio Calculator
Calculate the PaO2/FiO2 (P/F) ratio from arterial oxygen and inspired oxygen fraction, with the Berlin ARDS severity bands.
Open PaO2/FiO2 Ratio Calculator →Parkland Formula Calculator
Calculate Parkland burn resuscitation fluids: 4 mL per kg per percent burn, half in the first 8 hours and half over the next 16.
Open Parkland Formula Calculator →Peak Flow Calculator
Compare a peak expiratory flow reading with a personal best and find the green, yellow or red asthma action-plan zone.
Open Peak Flow Calculator →Pearl Index Calculator
Calculate the Pearl Index — pregnancies per 100 woman-years of contraceptive use — from study or clinic data.
Open Pearl Index Calculator →PECARN Rule Calculator
Apply the PECARN paediatric head-injury rule to estimate CT need after minor blunt head trauma, by age group.
Open PECARN Rule Calculator →Pediatric Blood Pressure Calculator
Screen a child’s blood pressure against the AAP simplified screening values by age and sex, and flag readings needing further evaluation.
Open Pediatric Blood Pressure Calculator →Pediatric Epinephrine Dose Calculator
Calculate weight-based paediatric epinephrine doses from PALS: IV/IO for cardiac arrest and IM for anaphylaxis, with auto-injector guidance.
Open Pediatric Epinephrine Dose Calculator →Pediatric Maintenance Fluids Calculator
Calculate paediatric maintenance fluids by the Holliday-Segar 4-2-1 rule, with an optional dehydration deficit estimate.
Open Pediatric Maintenance Fluids Calculator →Pediatric Transfusion Calculator
Estimate paediatric packed red cell volume from weight and the haemoglobin rise wanted, at 3 mL/kg per 1 g/dL.
Open Pediatric Transfusion Calculator →PERC Rule Calculator
Apply the eight PERC criteria to see whether pulmonary embolism can be ruled out in a low-risk patient without further testing.
Open PERC Rule Calculator →PHQ-9 Depression Screening Calculator
Score the nine PHQ-9 depression questions, with severity bands and a flag for any thoughts of self-harm.
Open PHQ-9 Depression Screening Calculator →PISA Radius Calculator
Calculate the effective regurgitant orifice area from the PISA flow-convergence radius, aliasing velocity and peak jet velocity.
Open PISA Radius Calculator →Pneumonia Severity Index Calculator
Score the Pneumonia Severity Index (PORT score) from age, comorbidity, vitals and labs, with risk classes I to V.
Open Pneumonia Severity Index Calculator →Ponderal Index Calculator
Calculate the ponderal (Rohrer) index from weight and height, with the body-mass index shown for context.
Open Ponderal Index Calculator →Pregnancy Test Timing Calculator
Find the earliest sensible pregnancy-test date from ovulation and test sensitivity, plus the missed-period date and an hCG doubling check.
Open Pregnancy Test Timing Calculator →Pregnancy Weight Gain Calculator
Check pregnancy weight gain against the Institute of Medicine ranges by pre-pregnancy BMI, with expected gain for the current week.
Open Pregnancy Weight Gain Calculator →Prescription Refill Date Calculator
Work out when a prescription runs out, when the next refill is due, and when the remaining refills are exhausted.
Open Prescription Refill Date Calculator →Prostate Volume Calculator
Calculate prostate volume by the ellipsoid formula from ultrasound dimensions, with PSA density when PSA is entered.
Open Prostate Volume Calculator →Protein-Creatinine Ratio Calculator
Convert a spot urine protein-creatinine ratio into g/g and mg/mmol, with the normal, elevated and nephrotic-range bands.
Open Protein-Creatinine Ratio Calculator →PSA Calculator
Interpret total PSA with age-adjusted ranges, free-PSA percentage, PSA density and PSA velocity in one place.
Open PSA Calculator →Pulmonary Vascular Resistance Calculator
Calculate pulmonary vascular resistance in Wood units and dyn·s·cm⁻⁵ from mean pulmonary artery pressure, wedge pressure and cardiac output.
Open Pulmonary Vascular Resistance Calculator →Qp/Qs Ratio Calculator
Calculate the pulmonary-to-systemic flow ratio (Qp/Qs) from oxygen saturations to size a cardiac shunt.
Open Qp/Qs Ratio Calculator →qSOFA Score Calculator
Score qSOFA from respiratory rate, systolic blood pressure and Glasgow Coma Scale to flag sepsis risk outside intensive care.
Open qSOFA Score Calculator →QTc Calculator
Correct the QT interval for heart rate by both the Bazett and Fridericia formulas, with sex-based prolongation flags.
Open QTc Calculator →Quit Smoking Calculator
See how much money you save and how many cigarettes you avoid after quitting smoking, with a life-regained illustration.
Open Quit Smoking Calculator →Race Time Predictor
Predict your finish time for any race distance from a known race result using the Riegel formula.
Open Race Time Predictor →Radiation Dose Calculator
Add up typical effective radiation doses from X-rays and CT scans and compare them with yearly background radiation.
Open Radiation Dose Calculator →Rapid Shallow Breathing Index Calculator
Calculate the rapid shallow breathing index from respiratory rate and tidal volume as a weaning aid.
Open Rapid Shallow Breathing Index Calculator →Rate Pressure Product Calculator
Multiply heart rate by systolic pressure to estimate myocardial oxygen demand at rest or exercise.
Open Rate Pressure Product Calculator →RBC Indices Calculator
Calculate MCV, MCH and MCHC from haemoglobin, haematocrit and red cell count, with a cell classification.
Open RBC Indices Calculator →Relative Fat Mass (RFM) Calculator
Estimate whole-body fat percentage from height and waist circumference with the Woolcott and Bergman formula.
Open Relative Fat Mass (RFM) Calculator →REM Sleep Calculator
Find bedtimes that let you wake at the end of a 90-minute sleep cycle, for 4, 5 or 6 cycles.
Open REM Sleep Calculator →Reticulocyte Count Calculator
Correct the reticulocyte count for anaemia and calculate the reticulocyte production index.
Open Reticulocyte Count Calculator →Reverse Due Date Calculator
Work backwards from an expected due date to an estimated last period start and conception date.
Open Reverse Due Date Calculator →Revised Cardiac Risk Index Calculator
Count the six Lee risk factors to estimate major cardiac complications after major non-cardiac surgery.
Open Revised Cardiac Risk Index Calculator →Revised Geneva Score Calculator
Score suspected pulmonary embolism probability with the Revised Geneva rule from history, symptoms and heart rate.
Open Revised Geneva Score Calculator →Revised Trauma Score Calculator
Calculate the Revised Trauma Score from coded Glasgow Coma Scale, systolic pressure and respiratory rate.
Open Revised Trauma Score Calculator →SAAG Calculator
Calculate the serum-ascites albumin gradient to separate portal-hypertensive from other causes of ascites.
Open SAAG Calculator →Salad Calories Calculator
Build a salad from ingredient weights and total its calories and protein from typical nutrition values.
Open Salad Calories Calculator →SAPS II Score Calculator
Calculate the SAPS II severity score and estimated hospital mortality from first-24-hour ICU values.
Open SAPS II Score Calculator →SCORAD Calculator
Score atopic dermatitis severity from extent, six intensity signs, itch and sleep loss with the SCORAD formula.
Open SCORAD Calculator →Sepsis Screening Calculator
Screen for possible sepsis with qSOFA and SIRS counts and get clear urgent-care direction. Screening aid only.
Open Sepsis Screening Calculator →Serum Osmolality Calculator
Calculate serum osmolality from sodium, glucose and BUN, with the osmolar gap when a measured value is known.
Open Serum Osmolality Calculator →Shock Index Calculator
Calculate shock index and modified shock index from heart rate and blood pressure as an early shock flag.
Open Shock Index Calculator →SIR Epidemic Model Calculator
Run an educational SIR epidemic model with your own transmission and recovery rates and see the peak and final size.
Open SIR Epidemic Model Calculator →Sleep Debt Calculator
Add up the gap between ideal and actual sleep over several nights and plan a gentle repayment.
Open Sleep Debt Calculator →Smoking Recovery Calculator
Track recovery milestones after quitting smoking, from the first 20 minutes to 15 years smoke-free.
Open Smoking Recovery Calculator →SNAP Score Calculator
Calculate the neonatal SNAP-II severity score from six first-12-hour NICU items with published point weights.
Open SNAP Score Calculator →Sobriety Calculator
Count days sober and total the money saved, drinks avoided and calories avoided since quitting alcohol.
Open Sobriety Calculator →Sodium Correction Calculator
Correct serum sodium for high blood glucose with the Katz formula, and estimate how one litre of IV fluid would move sodium using the Adrogué–Madias equation.
Open Sodium Correction Calculator →SOFA Score Calculator
Score organ dysfunction across respiration, coagulation, liver, cardiovascular, nervous system and kidneys with the Sequential Organ Failure Assessment (SOFA) table.
Open SOFA Score Calculator →Sperm Analysis Calculator
Check a semen analysis against the WHO 2021 reference limits: volume, concentration, total count, motility, vitality and morphology.
Open Sperm Analysis Calculator →Sports Drink Calculator
Work out your sweat rate from before-and-after weights, then get a fluid, sodium and carbohydrate plan for training or racing.
Open Sports Drink Calculator →STOP-Bang Sleep Apnea Screening Calculator
Answer the eight STOP-Bang questions to screen for obstructive sleep apnea risk — snoring, tiredness, observed apnea, blood pressure, BMI, age, neck size and sex.
Open STOP-Bang Sleep Apnea Screening Calculator →Stride Length Calculator
Estimate stride length from height, or measure it exactly from a known distance and step count — and convert it to steps per kilometre and per mile.
Open Stride Length Calculator →Stroke Volume Calculator
Calculate stroke volume from end-diastolic and end-systolic volumes, from cardiac output and heart rate, or from the LVOT diameter and velocity–time integral.
Open Stroke Volume Calculator →Sunscreen Amount Calculator
Find how much sunscreen you actually need: the dermatology standard is 2 mg per square centimetre of skin, which is far more than most people apply.
Open Sunscreen Amount Calculator →Sunscreen Calculator
Estimate how long you can stay in the sun with sunscreen: your skin type sets your unprotected burn time, the UV index scales it, and SPF multiplies it.
Open Sunscreen Calculator →Swimming Time Calculator
Turn a swim distance and pace into a finish time, with speed, splits and an energy estimate — for pool sets and open-water swims alike.
Open Swimming Time Calculator →Thanksgiving Calories Calculator
Build your Thanksgiving plate serving by serving — turkey, stuffing, sides, gravy, pie and drinks — and see the total, its share of a day, and the walk to burn it off.
Open Thanksgiving Calories Calculator →TI-RADS Calculator
Score a thyroid nodule with the ACR TI-RADS system: composition, echogenicity, shape, margin and echogenic foci give a TR level and a follow-up or biopsy recommendation.
Open TI-RADS Calculator →Tidal Volume Calculator
Set a lung-protective tidal volume from predicted body weight (Devine formula): enter height and sex, pick 6–8 mL/kg, and get the volume plus minute ventilation.
Open Tidal Volume Calculator →Time of Death Estimator
An educational postmortem-interval estimator based on body cooling (the Glaister equation): enter body temperature and see a rough hours-since-death figure with its wide uncertainty.
Open Time of Death Estimator →TIMI STEMI Score Calculator
Score 30-day mortality risk in ST-elevation MI with the TIMI STEMI score: eight admission variables, 0–14 points, each tied to a published mortality rate.
Open TIMI STEMI Score Calculator →TIMI UA/NSTEMI Score Calculator
Score 14-day risk of death, MI or urgent revascularisation in unstable angina and NSTEMI with the seven-point TIMI UA/NSTEMI score.
Open TIMI UA/NSTEMI Score Calculator →Tinetti Assessment Calculator
Score the full Tinetti Performance Oriented Mobility Assessment: nine balance items (0–16) and ten gait items (0–12) combine into a 0–28 fall-risk score.
Open Tinetti Assessment Calculator →tPA Dosing Calculator
Calculate the standard alteplase (tPA) dose for acute ischemic stroke: 0.9 mg/kg up to 90 mg, with 10% as a bolus and the rest infused over 60 minutes.
Open tPA Dosing Calculator →Tramadol Dosage Calculator
Check an adult tramadol regimen against published dosing: immediate-release 50–100 mg every 4–6 hours (max 400 mg/day) or extended-release 100–300 mg once daily.
Open Tramadol Dosage Calculator →Transferrin Saturation Calculator
Calculate transferrin saturation (TSAT) from serum iron and total iron-binding capacity, with unsaturated iron-binding capacity and an iron-status band.
Open Transferrin Saturation Calculator →Triathlon Time Calculator
Add up a triathlon finish time from swim, bike and run legs plus both transitions, with per-leg paces for Sprint, Olympic, 70.3 and Ironman distances.
Open Triathlon Time Calculator →TTKG Calculator
Calculate the transtubular potassium gradient (TTKG) from urine and plasma potassium and osmolality, to help separate renal from non-renal causes of potassium disorders.
Open TTKG Calculator →Twin Probability Calculator
A rough, educational estimate of twin-pregnancy probability from conception method, maternal age, family history, previous twins and BMI — not a personal prediction.
Open Twin Probability Calculator →Urea Reduction Ratio Calculator
Measure dialysis adequacy with the urea reduction ratio, and add single-pool Kt/V by the Daugirdas equation when session length, ultrafiltration and post-dialysis weight are known.
Open Urea Reduction Ratio Calculator →Urine Output Calculator
Work out urine output in mL per kg per hour from total volume, collection time and body weight, with the usual adult range.
Open Urine Output Calculator →Vaccine Efficacy Calculator
Calculate vaccine efficacy from case counts in vaccinated and unvaccinated groups, with attack rates for both groups.
Open Vaccine Efficacy Calculator →Vaccine Immunity Calculator
Model how vaccine effectiveness fades over time with a transparent exponential-waning model you can adjust, clearly labelled as educational only.
Open Vaccine Immunity Calculator →VBAC Risk Score Calculator
Estimate the chance of a successful vaginal birth after caesarean with the Grobman 2021 refit model, which uses no race or ethnicity terms.
Open VBAC Risk Score Calculator →Vitamin A Intake Calculator
Add up vitamin A from food and supplements in mcg RAE, compare it with the RDA for your group and flag the upper level.
Open Vitamin A Intake Calculator →Vitamin D Intake Calculator
Add up vitamin D from food and supplements in IU and mcg, compare it with the RDA for your age group and flag the upper level.
Open Vitamin D Intake Calculator →VLDL Cholesterol Calculator
Estimate VLDL cholesterol from triglycerides with the Friedewald equation, in mg/dL or mmol/L, with the usual range.
Open VLDL Cholesterol Calculator →VTE Risk in Pregnancy Calculator
Count venous thromboembolism risk factors in pregnancy into a low, intermediate or high band, as an educational triage aid for clinician discussion.
Open VTE Risk in Pregnancy Calculator →Waist-to-Height Ratio Calculator
Divide waist by height for a shape-based health indicator, with the widely used 0.5 cut-off and unit switching between cm and inches.
Open Waist-to-Height Ratio Calculator →Waist-to-Hip Ratio Calculator
Divide waist by hip circumference and compare it with the WHO high-risk cut-offs for men and women, with cm/inch switching.
Open Waist-to-Hip Ratio Calculator →Warfarin Dosing Calculator
Adjust a stable weekly warfarin dose from the latest INR using the published maintenance table for target INR 2.0 to 3.0, for prescriber discussion only.
Open Warfarin Dosing Calculator →Weighted Blanket Calculator
Find the recommended weighted blanket weight from body weight using the common 10% guideline, with a 7 to 12% range.
Open Weighted Blanket Calculator →Wells PE Score Calculator
Score pulmonary embolism probability with the published Wells criteria, in both the three-tier and the simplified two-tier forms.
Open Wells PE Score Calculator →Wilks Calculator
Compute the classic Wilks coefficient and Wilks score from body weight and total lifted, for men and women.
Open Wilks Calculator →Winters Formula Calculator
Check respiratory compensation in metabolic acidosis with Winters formula, comparing measured pCO2 with the expected range.
Open Winters Formula Calculator →No tools match your search yet — try another word.