High-utility tools
Fuel Economy Converter
Convert fuel efficiency between km/L, US mpg, UK mpg, and liters per 100 kilometers.
Interactive calculator
Convert fuel economy units
Translate fuel efficiency between km/L, US mpg, UK mpg, and liters per 100 kilometers.
Results
Result (L/100km)
7.840486
30 mpg US = 7.840486 L/100km
How to use it
- 01Enter the vehicle efficiency or consumption figure.
- 02Choose the source fuel economy unit and the target unit.
- 03Use the converted result to compare cars, trips, or published vehicle ratings.
Result guide
- Liters per 100 km represent fuel consumption, so that unit converts inversely compared with mpg or km/L.
- The page supports both US and UK mpg because the gallon sizes are different.
- This is a unit converter, not a trip-cost or fuel-budget estimator.
About this calculator
Fuel-economy conversion is useful for comparing cars across countries because different markets describe the same efficiency using different systems.
A useful page should support both efficiency-style units like mpg and consumption-style units like liters per 100 km, because both are widely used.
Frequently asked questions
Why are US mpg and UK mpg different?
Because the US gallon and the UK imperial gallon are different sizes, so the same mpg number does not mean the same efficiency.
Why does liters per 100 km move in the opposite direction?
Because it expresses fuel consumed per distance instead of distance traveled per fuel unit.
Can this help compare imported car specs?
Yes. That is one of its most practical uses because different markets publish fuel economy differently.
Reviewed by Dr. Elena Rostova, MD, PhD
Medical Doctor & Clinical Nutrition Researcher
Reviews health index calculators, unit converter benchmarks, and mathematical models against WHO guidelines and peer-reviewed research.
Sources: Per WHO guidelines / Peer-reviewed research/Standard unit-conversion constants and base-unit references/Cross-checks against known engineering and metric conversion values
Disclaimer: Calculator results are for general reference and educational purposes only per WHO standards. Health indexes and mathematical models are not a substitute for professional medical diagnosis, clinical nutrition, or certified trade advice.
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