MPG to L/100km Converter

MPG (US) to L/100km — quick reference

The formula

Fuel economy flips between the two systems — distance-per-fuel versus fuel-per-distance — so the conversion is a reciprocal through a fixed constant, not a simple factor:

L/100km = 235.214583 ÷ MPG (US)

Worked example with the default: 235.214583 ÷ 28 = 8.4 L/100km. The constant bundles the gallon-to-liter and mile-to-kilometer factors into one number, scaled to “per 100 km.”

Because it’s a reciprocal, equal MPG steps are not equal L/100km steps: going 20 → 30 MPG saves far more fuel than 40 → 50 MPG, even though both are a 10-MPG gain. The L/100km scale shows that honestly, which is part of why much of the world prefers it.

How to use the mpg to l/100km converter

Most of the world rates fuel economy in liters per 100 kilometers, while the US uses miles per gallon — and the two run in opposite directions, which makes European reviews and spec sheets confusing to a US reader. This converter turns MPG into L/100km so you can read a foreign road test in familiar terms; Swap goes back to MPG.

The key idea is that the scales are inverted. With MPG, bigger is better — more miles per gallon. With L/100km, smaller is better — less fuel burned per distance. So a thrifty 50 MPG car is a low 4.7 L/100km, while a thirsty 15 MPG truck is a high 15.7 L/100km. Once you internalize “lower L/100km = more efficient,” the foreign numbers stop feeling backwards.

The default here, 28 MPG, converts to 8.4 L/100km — and 28 MPG is also the default in our fuel cost calculator, so the two pair up: convert a car’s economy here, then take the MPG to the fuel calculator to price an actual drive. A 30 MPG sedan is 7.8 L/100km; a 22 MPG SUV is 10.7.

There’s no clean mental shortcut because the relationship is a reciprocal, not a multiply — halving the MPG doubles the L/100km, it doesn’t shift it by a fixed amount. That’s exactly why a calculator helps: just enter the MPG figure from the US window sticker or review and read the L/100km the rest of the world would quote.

Frequently asked questions

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