Fuel consumption calculator
See what your car actually burns from a fill-up, or estimate fuel for a trip — then carry the number into trip cost and TCO.
Measure economy, then budget the trip and ownership — paste the result into trip fuel cost, check the year in annual running cost, or get the full picture in the car TCO calculator.
Results
Enter data and click Calculate.
How the results are calculated
Measured: consumption = (fuel ÷ distance) × 100 → L/100 km (and km/L).
Measured: mpg = distance (mi) ÷ fuel (gal). Form labels follow whatever units your header is set to.
Estimate mode multiplies known efficiency by distance to get the fuel you'll need — again, in the units shown above.
Using this motoring calculator
- Measure economy from a real fill-up (distance + fuel added), or estimate it from a known consumption figure.
- Switch result units (L/100 km, km/L, mpg) without reloading the page.
- Add fuel price and annual distance if you want to see how driving style changes your yearly fuel spend.
- Carry the number into trip fuel cost or annual running cost.
Frequently asked questions
How do I measure consumption from a fill-up?
In measure mode, enter the distance since your last full tank and the fuel you just added to fill up. You'll get average economy for that stretch.
Measure vs estimate — what's the difference?
Measure comes from a real fill-up. Estimate takes distance plus a known economy figure to size fuel for a trip — handy before you leave, when you haven't tanked yet.
Why doesn't this match the manufacturer sticker?
Sticker numbers come from a lab cycle. Real driving mixes city and highway, weather, load, tires and how you drive — a fill-up reading is closer to your day-to-day.
Where do L/100 km, km/L and mpg come from?
From the units in the header. Metric gives L/100 km (and km/L); US — mpg. You can also flip the result unit without reloading.
What are optional fuel price and annual mileage for?
To see a rough cost for the stretch and — with annual mileage — how city / mixed / highway styles translate into yearly fuel spend.
What does the driving-style chart show?
A rough compare: city usually burns more, highway less. It doesn't replace a fill-up reading — it shows order of magnitude at the price you entered.
How do I reuse the result?
Paste the economy into trip fuel cost, annual running cost, or full TCO — fuel is only one line there.