Conversions · Free online calculator
Fuel Economy Converter
Convert between km/L, miles per US gallon and litres per 100 km.
CALCULATOR GUIDE
How the Fuel Economy Converter works
Convert between km/L, miles per US gallon and litres per 100 km. This guide explains the inputs, calculation method, example and key limitations so you can check whether the result fits your question.
Convert between km/L, miles per US gallon and litres per 100 km.
Convert fuel economy using km/L as a bridge between the selected units.
Inputs to prepare
Before you calculate, gather the values the question asks for and check their units. Choose options carefully and use consistent dates, periods and starting values. The notes below describe the fields shown in the calculator above.
- ValueUse a numeric value and keep the displayed unit consistent. Allowed range: 0.01 to 1000000000
- From unitChoose the option that matches your situation. Options include: Kilometres per litre, Miles per US gallon, Litres per 100 km
- To unitChoose the option that matches your situation. Options include: Kilometres per litre, Miles per US gallon, Litres per 100 km
How to use the Fuel Economy Converter
- Enter the details. Fill in each required field and use the units or formats shown next to it.
- Check your assumptions. Confirm dates, comparison values, time periods and selected options before submitting.
- Calculate and review. Read the result together with its unit, time period and any additional breakdown.
- Compare scenarios. Change one input at a time if you want to understand how different values affect the outcome.
Formula and worked example
Convert fuel economy using km/L as a bridge between the selected units.
Example calculation
Check whether a quoted mpg figure uses US or imperial gallons; this tool uses US gallons.
Try the same values in the calculator above. If your result differs, recheck the units, input order, assumptions and rounding displayed by the tool.
What your result means
Convert between km/L, miles per US gallon and litres per 100 km. Read the result label and unit carefully. A useful estimate describes only the inputs and assumptions supplied; it should not be treated as proof of a future outcome or a guarantee.
- Check the displayed unit and period before comparing results.
- Use values from a reliable source and keep them up to date.
- Repeat the calculation with an independent check when the outcome matters.
Assumptions and limitations
Values of zero cannot be converted into reciprocal fuel-consumption units.
The calculator is a general-purpose tool. Actual outcomes may depend on local rules, provider terms, measurement standards or personal circumstances not represented in the fields. For consequential financial, health, legal, tax or construction decisions, confirm the result with an appropriate authoritative or qualified source.
Frequently asked questions
How does the fuel economy converter work?
Convert fuel economy using km/L as a bridge between the selected units.
Can I rely on the result as an exact answer?
Values of zero cannot be converted into reciprocal fuel-consumption units.
How can I get a more useful estimate?
Use accurate inputs, keep units consistent, check the assumptions on this page and compare the output with an authoritative source when the result affects a financial, health, construction or legal decision.
For transparency, use the formula and worked example to check the output. Add authoritative references and have the calculation reviewed before relying on it for a consequential decision.