Mileage (km/l) Calculator

Work out mileage (km/l) instantly with clear inputs, formula shown and shareable results.

About Mileage (km/l) Calculator

The brim-to-brim method is the reliable way to measure mileage: fill the tank, note the odometer, drive, then refill completely and divide distance by the fuel added. Both fills must be to the same point for the answer to mean anything.

Formula

Mileage

km/L = (end odometer - start odometer) / litres added

Worked example

With the default values below, Mileage (km/l) Calculator returns Mileage of 14.38. Change any input above and every figure here is recalculated in your browser.

Inputs used

Odometer at fill-up: 42,180 km
Odometer at next fill-up: 42,640 km
Fuel added: 32 L
Fuel price: 1.58

Results

Mileage: 14.38 km/L
Distance covered: 460.00 km
Consumption: 6.96 L/100km
Cost per kilometre: $0.1099

Step by step

1Values used
2Mileage
3Mileage= 14.38 km/L
4Distance covered= 460.00 km
5Consumption= 6.96 L/100km
6Cost per kilometre= 0.1099

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why not trust the trip computer?

On-board computers estimate from injector timing and are commonly 3-8% optimistic. Brim-to-brim over several tanks is the honest figure.

Why measure over several tanks?

Fill-level variation adds noise to a single measurement. Averaging three or four tanks gives a figure accurate to a couple of percent.