MPG to L/100km Converter — Fuel Economy

Enter fuel economy in any unit to see US MPG, UK MPG, L/100km, and km/L side by side.

—MPG (US)
—MPG (UK)
—L/100km
—km/L
How this conversion works. Uses the inverse relation L/100km = 235.215 ÷ MPG(US) with exact US gallon (3.785411784 L), imperial gallon (4.54609 L), and mile (1.609344 km) definitions. Reference: US EPA fueleconomy.gov.

How to use

  1. Enter your fuel economy value.
  2. Pick its unit — US MPG, UK MPG, L/100km, or km/L.
  3. Read all four equivalents instantly and copy the summary.

Frequently asked questions

Why is MPG to L/100km an inverse conversion?

MPG measures distance per fuel; L/100km measures fuel per distance. The relation is L/100km = 235.215 ÷ MPG(US) — doubling MPG halves consumption.

Why are UK and US MPG different?

The gallons differ: US 3.785412 L vs imperial 4.54609 L. The same car scores about 20% higher in UK MPG (×1.20095).

What is a good fuel economy?

On the US EPA combined cycle, 30+ MPG (under 7.8 L/100km) is efficient for gasoline cars; hybrids reach 50+ MPG (4.7 L/100km).

Is my data sent to a server?

No. The conversion runs entirely in your browser using exact gallon and mile definitions.

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