Fuel Rate Calculator
Fuel rate calculator works out Converted economy and Converted unit from Distance travelled, Fuel used and Fuel price. The default figures on this page give converted economy of 3.5714; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
5 steps
- Distance 350 km = 350 km; fuel 12.5 L = 12.5 L.
- Economy = 350 km / 12.5 L = 28 km/L.
- 28 km/L = 3.571429 L/100km.
- Fuel for 350 km = 350 km / 28 km/L = 12.5 L = 12.5 L.
- Cost = 12.5 L x 3.6 = 45, i.e. 0.1286 per km.
Its 7 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
4 sources
What the fuel rate calculator calculates
Converts between miles per gallon (US and imperial), kilometres per litre and litres per 100 km, and works out trip fuel use, fuel cost and measured economy from distance and fuel volume.
How to use this fuel rate calculator
Enter Distance travelled, Fuel used and Fuel price. Converted economy updates as you type. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Converted economy, Converted unit and Miles per US gallon.
The method follows NIST Handbook 44, Appendix C - General Tables of Units of Measurement, NIST Special Publication 811, Guide for the Use of the International System of Units (SI), Weights and Measures ACT 1985 (UK), Schedule 1 and US EPA, Fuel Economy Guide - Fuel Economy and Annual Fuel Cost calculations.
What you can compare
Change one input at a time to see how it affects Converted economy, Converted unit and Miles per US gallon. The inputs you can vary are Distance travelled, Fuel used and Fuel price.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How to calculate fuel rate?
Converts between miles per gallon (US and imperial), kilometres per litre and litres per 100 km, and works out trip fuel use, fuel cost and measured economy from distance and fuel volume. Open “How this is worked out” beside the result to see each step for your own figures.
How to calculate fuel price per mile?
It needs Distance travelled, Fuel used and Fuel price. Nothing else is required, and the figures stay in your browser.
How do I calculate the cost of fuel for a trip?
The result gives Converted economy, Converted unit, Miles per US gallon, Miles per imperial gallon, Kilometres per litre and Litres per 100 km, each labelled with its unit so the figure can be read on its own.
What information do I need for the fuel rate calculator?
You need Distance travelled, Fuel used and Fuel price. The page opens with default figures that give converted economy of 3.5714, so you can see the scale before entering your own.
What does this fuel rate calculator show?
It shows Converted economy, Converted unit, Miles per US gallon, Miles per imperial gallon, Kilometres per litre, Litres per 100 km, Miles per litre and Kilometres per US gallon, with the working and any warnings for your entries.
Can I check how the fuel rate calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.