Mean arterial pressure from systolic and diastolic readings, with pulse pressure alongside.
Estimate only — this is not a diagnosis. See a clinician about any concerning reading.
mean arterial pressure (mmHg)
How to use this tool
The pressure when the heart contracts.
The pressure when the heart rests between beats.
The big number is the time-weighted average arterial pressure.
The gap between the two numbers is shown underneath.
Formula & worked example
For 120/80 mmHg: MAP = 80 + (120 − 80) ÷ 3 = 80 + 13.33 = 93.3 mmHg, with a pulse pressure of 40 mmHg.
Limitations — read this before you rely on it
This is a single-reading estimate, not a diagnosis: blood pressure varies through the day, with cuff size, arm position and stress. A MAP below about 60 mmHg can mean organs are under-perfused and needs urgent clinical attention, but only a clinician can interpret your readings in context. This tool never replaces medical advice.
Frequently asked questions
The average pressure in the arteries over one full heartbeat — a better guide to organ perfusion than either number alone.
The heart spends about twice as long in diastole (resting) as in systole (pumping), so the average leans toward the diastolic value.
Roughly 70–100 mmHg is commonly cited; below 60 mmHg is concerning. Individual targets vary — ask a clinician.
Systolic minus diastolic. For 120/80 it is 40 mmHg; a very wide pulse pressure can itself be clinically interesting.
No. This is an arithmetic aid for a reading you already have. Concerning or repeated high/low readings should be discussed with a clinician.