Fuel Efficiency Converter

The Fuel Efficiency Converter is an online calculation tool that converts between all 10 fuel efficiency units, including both distance-per-volume formats (km/L, mpg, mi/L) and volume-per-distance formats (L/100km, gal/100km, gal/100mi). While km/L, mpg, and mi/L express 'distance traveled per unit of fuel,' L/100km, gal/100km, and gal/100mi express 'fuel needed per distance,' representing inverse relationships.

This tool accurately handles those distinctions and automates complex multi-unit conversions. The "Swap Units" button enables quick reverse conversions, and copy-to-clipboard icons on each result row allow instant value transfer. Unified comparison of fuel economy ratings worldwide is now possible, making it ideal for comparing vehicle fuel economy when buying a new car, choosing rental cars, and calculating fuel costs for international travel.