Car Mileage Calculator

Calculate car mileage from kilometres travelled and litres refilled. Enter your own values below to see fuel efficiency and check the method behind it.

All calculators

Your inputs

Change the example values to match your situation.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Mileage = kilometres driven ÷ litres consumed.

KEEP EXPLORING

View category
Bike Mileage CalculatorFuel Efficiency CalculatorEV Charging Cost CalculatorEV Range CalculatorPetrol vs Diesel Cost CalculatorPetrol vs EV Cost Calculator

What is Car Mileage Calculator?

Car Mileage Calculator helps you calculate car mileage from kilometres travelled and litres refilled.

The main result is fuel efficiency, with a breakdown of fuel consumption. The formula, example and assumptions below explain how to interpret it.

How to use Car Mileage Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather distance travelled (km) and fuel consumed (litres). Use values from the same situation or reporting period.
  2. Replace the example distance travelled with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read fuel efficiency with its result breakdown. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter distance travelled in km, at least 0. Decimals are accepted.
  • Enter fuel consumed in litres, at least 0.000001. Decimals are accepted.

Car Mileage Calculator: a worked example

With the inputs below, the result is 15 km/litre (fuel efficiency). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Distance travelled (km)300 km
Fuel consumed (litres)20 litres
Fuel efficiency15 km/litre
Fuel consumption6.666667 litres/100 km

Understanding the Car Mileage result

Read fuel efficiency alongside fuel consumption. These describe different parts of the same calculation.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

  • Example Fuel consumption: 6.666667 litres/100 km

Car Mileage Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Use mileage from comparable driving conditions. A fuel-only comparison excludes financing, maintenance and resale unless those amounts are specifically entered.

For wider guidance, visit Bureau of Energy Efficiency. The formula and scope of this specific tool are stated on this page.

Car Mileage Calculator FAQs

What does Car Mileage Calculator calculate?

Car Mileage Calculator helps you calculate car mileage from kilometres travelled and litres refilled. Its main output is fuel efficiency in km/litre.

What inputs do I need for Car Mileage Calculator?

You need distance travelled (km) and fuel consumed (litres). Use the field labels and units to match your figures to the formula.

Which formula does Car Mileage Calculator use?

Mileage = kilometres driven ÷ litres consumed.

What is a worked example for Car Mileage Calculator?

Example inputs: Distance travelled: 300 km; Fuel consumed: 20 litres. The result is 15 km/litre (fuel efficiency).

How should I enter distance travelled?

Enter distance travelled in km, at least 0. Decimals are accepted.

How do I choose fuel consumed?

Enter fuel consumed in litres, at least 0.000001. Decimals are accepted. The example uses 20 litres; replace it if your circumstances differ.

How should I read fuel efficiency?

Read fuel efficiency alongside fuel consumption. These describe different parts of the same calculation.

Why might my Car Mileage Calculator result differ from my records?

Use mileage from comparable driving conditions. A fuel-only comparison excludes financing, maintenance and resale unless those amounts are specifically entered. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Car Mileage Calculator?

Yes. Note your first fuel efficiency, change distance travelled or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Car Mileage Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.