Using the Gas Mileage Calculator
Enter kilometers and liters. Use fuel consumed over the measured interval rather than tank capacity or an unrelated refill amount. The two metric results move in opposite directions: lower liters per hundred kilometers means better economy, while higher kilometers per liter means better economy.
Worked example
Use the example inputs below to reproduce this result. These are the form's starting values, not recommended targets. Changing your inputs updates your result above; this worked example stays fixed for comparison. Results are rounded for display.
Example inputs
- Distance traveled (km)
- 500
- Fuel used (L)
- 35
Example result
- Fuel use (L/100 km)
- 7
- Distance per litre (km/L)
- 14.285714
- US miles per gallon
- 33.602083
Method and assumptions
Distance divided by fuel consumed; US gallon = 3.785411784 litres.
Use measurements from the same situation
Vehicle and trip estimates are easiest to compare when the inputs refer to the same journey, vehicle or operating condition. Keep the distance unit explicit and separate measured values from planning assumptions. If you change several inputs at once, record which ones changed so that a different result can be traced to a specific assumption.
Common question
Is the MPG result based on a US or imperial gallon?
It uses the US gallon. An imperial gallon has a different volume, so a UK-style MPG figure will not match even when it describes the same consumption. Check the gallon definition before comparing figures from different sources.
Guide updated .