Fuel consumption converter
Choose the unit printed in your handbook or trip computer. US and Imperial mpg use different gallons.
Enter your values, then calculate.
Method and limitations
Let C be L/100 km. km/L = 100/C; mpg = 100 × litres per gallon / (1.609344 × C). Values must be positive; zero consumption has no finite reciprocal. Results are rounded for display only. Exact conversions: 1 mile = 1.609344 km; 1 US liquid gallon = 3.785411784 L (NIST). 1 Imperial gallon = 4.54609 L (UK Act). NIST: www.nist.gov ; UK: www.legislation.gov.uk
Sources
- NIST Handbook 44 (2023), Appendix C — National Institute of Standards and Technology,
- Weights and Measures Act 1985, Schedule 1, Part IV — UK Parliament,