L/100km to MPG Converter

L/100km to MPG (US) — quick reference

The formula

The two systems are reciprocals — fuel-per-distance versus distance-per-fuel — joined by a fixed constant, so MPG comes from dividing that constant by the L/100km figure:

MPG (US) = 235.214583 ÷ L/100km

Worked example with the default: 235.214583 ÷ 8 = 29.4 MPG. The constant folds the liter-to-gallon and kilometer-to-mile factors into a single “per 100 km” number.

Because it’s a reciprocal, the same drop in L/100km means different MPG gains at different points: 10 → 8 L/100km is worth more MPG than 6 → 4, even though both fall by 2. The MPG scale stretches the efficient end, which is why frugal cars show big MPG spreads for small L/100km changes.

How to use the l/100km to mpg converter

Renting a car abroad or reading a non-US spec sheet, you’ll meet fuel economy as liters per 100 kilometers — and if you think in miles per gallon, the figure means nothing until it’s converted. This tool turns L/100km into US MPG so a foreign economy rating clicks into place; Swap returns to L/100km.

Remember the scales run opposite ways. L/100km gets better as it gets smaller; MPG gets better as it gets bigger. So a frugal 5 L/100km rental is a strong 47 MPG, while a thirsty 12 L/100km vehicle is just 19.6 MPG. When the rental desk quotes “about 6 liters per hundred,” that’s a healthy 39 MPG — better than it sounds to an American ear.

The default, 8 L/100km, is 29.4 MPG — a typical European mid-size figure that lands as an unremarkable US economy number. Other quick anchors for trip planning: 5 L/100km is 47 MPG, 7 is 33.6, and 10 is 23.5. Converting the rental’s rating tells you roughly how often you’ll be visiting the (pricier, per-liter) pump.

There’s no tidy mental trick, because the conversion is a reciprocal — going from 5 to 10 L/100km doesn’t subtract a fixed amount of MPG, it roughly halves it. That’s the whole reason to use a calculator: enter the L/100km figure from the brochure or the rental terms and read the MPG you actually reason in.

Frequently asked questions