About this calculator

US gallon (3.78541 L) is smaller than UK (4.54609 L), so a US MPG number looks lower for the same efficiency. L/100km is the European norm.

Frequently asked questions

What does the MPG ↔ L/100km Converter do?

Convert fuel economy between US MPG, UK MPG and L/100km. US gallon (3.78541 L) is smaller than UK (4.54609 L), so a US MPG number looks lower for the same efficiency. L/100km is the European norm.

Is the MPG ↔ L/100km Converter free to use?

Yes. Every calculator on Calcora is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the MPG ↔ L/100km Converter?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified automotive & mechanic professional before committing to a purchase or a job.

What inputs does the MPG ↔ L/100km Converter need?

Enter values for: Value, Unit. Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the MPG ↔ L/100km Converter on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcora.