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Fuel consumption calculator

Work out your fuel consumption per 100 km and its cost.

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The Fuel consumption calculator turns Distance (km), Fuel used (L), Fuel price (per L) into Consumption (L/100 km), Fuel cost, instantly and for free. For instance, with Distance (km) = 500, Fuel used (L) = 32 and Fuel price (per L) = $1.85 it returns Consumption (L/100 km) = 6.4 and Fuel cost = $59.20.

How to use it

  1. Enter your values: Distance (km), Fuel used (L), Fuel price (per L).
  2. Read the result instantly: Consumption (L/100 km), Fuel cost.

Frequently asked questions

What does the Fuel consumption calculator actually compute?

It takes Distance (km), Fuel used (L) and Fuel price (per L) and derives Consumption (L/100 km) and Fuel cost from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

3 values: Distance (km), Fuel used (L) and Fuel price (per L) ($). Nothing else is required — no account, no file upload.

Can you show a worked example?

With Distance (km) = 500, Fuel used (L) = 32 and Fuel price (per L) = $1.85, the calculator returns Consumption (L/100 km) = 6.4 and Fuel cost = $59.20. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Distance (km) = 550, Fuel used (L) = 35 and Fuel price (per L) = $3.70 instead, Consumption (L/100 km) goes from 6.4 to 6.364 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Distance (km) = 450, Fuel used (L) = 29 and Fuel price (per L) = $0.93, Consumption (L/100 km) comes out at 6.444. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Deciding between two cars, or between keeping one and replacing it: fuel or charging, insurance, depreciation and what a kilometre really costs.

What is the most common mistake?

Comparing on fuel alone. Depreciation is usually the largest line in the first years and dwarfs the difference in consumption between two comparable cars.

What is the difference between the Fuel consumption calculator and the Fuel cost calculator?

This one returns Consumption (L/100 km) and Fuel cost; the Fuel cost calculator returns Fuel needed (L) and Total cost. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Fuel savings calculator is the closest one after this: Compare the yearly fuel cost of two cars and see how much you'd save.

What else is worth having open alongside it?

MPG calculator (fuel economy) and Fuel range calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
How-toHow to Improve Fuel Economy: Driving Habits That Actually SaveSmoother driving, correct tire pressure, less weight and lower motorway speed can cut fuel use noticeably. Here is what each one is worth.ExplainerThe Fuel Saving That Is Not LinearGoing from 10 to 20 mpg saves six times more fuel than going from 30 to 40, over the same distance. The reason is that fuel used is the reciprocal of fuel economy — and it changes which vehicle you should replace first.ExplainerWhat a Car's CO2 Figure Actually MeasuresA car's CO2 number and its fuel consumption number are the same measurement in different units, tied together by chemistry that you can do on paper. Here is the derivation, and then the three things the figure quietly leaves out.How-toThe Real Cost Per Mile of Driving: Beyond Just FuelFuel is only part of what a mile costs. Add depreciation, insurance and maintenance to find your true cost per mile — and why it is higher than the pump suggests.GuideMileage Allowances: the Official Scales in France, Spain and Italy, and What They Do Not CoverOne country gives you a formula that changes with the car's horsepower and the distance driven, one gives everybody the same figure per kilometre, and one publishes a table per model. All three are meant to cover the whole cost of running a car, and all three leave out things people assume are included.ExplainerStopping Distance Is Mostly Not BrakingTotal stopping distance is two distances added together, and they follow different laws — one grows with speed, the other with speed squared. That single fact explains why doubling your speed roughly triples the distance.