Mileage Calculator

Find your car or bike's real fuel economy from the distance you drove and the fuel you used. Shows km/L, L/100 km, mpg (US) and mpg (UK) together.

How to use the Mileage Calculator

  1. Fill the tank to full and reset the trip meter.
  2. Drive normally. When you next fill up, enter the distance on the trip meter (km or miles).
  3. Enter the fuel it took to fill the tank again, in liters or gallons.
  4. Read your mileage in km/L, L/100 km and mpg. Add what you paid to see the cost per km or mile.

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How to calculate mileage

Divide the distance you drove by the fuel you used.

Mileage (km/L) = distance (km) ÷ fuel used (L)
Mileage (mpg) = distance (miles) ÷ fuel used (gallons)
L/100 km = fuel used (L) ÷ distance (km) × 100

Example: you drove 450 km and refilling took 32 L. Your mileage is 450 ÷ 32 = 14.06 km/L, which is 7.11 L/100 km or 33.1 mpg (US).

The full-tank method

Measuring from one full tank to the next is the most accurate way to check mileage at home:

  1. Fill the tank until the pump clicks off and reset the trip meter to zero.
  2. Drive as you normally do, ideally for at least 300 km (about 200 miles).
  3. Fill to full again at the same pump if you can, and note the liters or gallons added.
  4. Divide the trip distance by that amount of fuel.

Repeat over two or three tanks and average the results. One tank can be thrown off by a single traffic jam or a long motorway run.

Why real mileage is lower than the official figure

Official figures come from laboratory tests at gentle speeds without traffic, air conditioning or extra weight. Real-world mileage is usually 10–25% lower. Your own figure is the one to use when you plan a trip; enter it in the Trip Fuel Cost Calculator.

Frequently asked questions

How do I calculate my car's mileage?

Fill the tank, reset the trip meter, drive, then fill up again. Divide the distance on the trip meter by the liters (or gallons) needed to refill. 450 km ÷ 32 L = 14.06 km/L.

What is a good mileage for a car?

For a petrol car, about 14–20 km/L (33–47 mpg US, or 5–7 L/100 km) is efficient. Hybrids often reach 20–25 km/L, while large SUVs and pickups may get 7–10 km/L.

How do I convert km/L to L/100 km?

Divide 100 by the km/L figure. 12.5 km/L = 100 ÷ 12.5 = 8 L/100 km.

How do I convert km/L to mpg?

Multiply km/L by 2.352 for US mpg or by 2.825 for UK mpg. 15 km/L is about 35.3 mpg (US) or 42.4 mpg (UK).

Can I use this for a motorbike or truck?

Yes. Distance divided by fuel used works for any vehicle that burns petrol, diesel or LPG.

Why is my mileage lower in the city?

Stopping, idling and accelerating from standstill use much more fuel than steady driving, so city mileage is often 15–30% lower than on the highway.

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