Trip fuel cost — distance, consumption and fuel price, with cost per mile or kilometre and a split between passengers.
Total fuel cost
—How to use this tool
Miles and gallons, or kilometres and litres — the maths is identical, the units are not.
Your trip length and your car's real-world economy, not just the brochure figure.
The price per gallon or per litre at the pump you will actually use.
Add passengers to split the fuel bill fairly.
Formula & worked example
300 miles at 30 mpg uses 10 gallons; at $3.50 a gallon that is $35.00 — $17.50 each for 2 people. 500 km at 8 L/100 km uses 40 litres.
Limitations — read this before you rely on it
Real consumption varies with speed, load, hills and weather, so treat the result as a planning figure and keep a margin for the trip.
Frequently asked questions
Divide miles by your mpg (or multiply km by L/100 km and divide by 100) — this calculator does both.
Around 30 mpg combined is typical for a modern petrol car; hybrids often exceed 50 mpg.
Yes — fuel use rises sharply above about 55 mph, and air conditioning and roof loads add more.
Tolls, parking and food are separate — this calculator splits fuel only.
Fill the tank, reset the trip meter, and divide miles driven by gallons used at the next fill.