MPG to L/100km
Convert mpg (us) to liter/100 km instantly — type a value and read the result, with the exact formula shown.
Example
1 mpg = 235.2146 L/100km, 5 mpg = 47.04292 L/100km, 10 mpg = 23.52146 L/100km.
How it works
L/100km = 235.215 ÷ mpg (US). Every value is converted through a single km/L base unit using internationally defined conversion factors, so any from/to pair stays consistent.
Good to know
Converting US miles per gallon to liters per 100 kilometers is something drivers do constantly when comparing cars across borders — pricing out a rental in Europe, reading a spec sheet for an imported vehicle, or translating an American road-trip estimate into the units a European fuel pump and trip computer actually display. The two figures describe the same physical efficiency from opposite directions, which is exactly why people get tripped up.
MPG (US) is an imperial-style measure rooted in the US customary system, where the gallon is 3.785 liters and distance is in miles. L/100km is the metric "fuel consumption" standard used across Europe, most of Asia, and on virtually every modern dashboard outside North America. The crucial difference is direction: MPG is distance per fuel, so higher is better, while L/100km is fuel per distance, so lower is better. That inversion is why the conversion is a division, not a multiplication.
The handy shortcut is the constant 235.2146: just divide it by your MPG to get L/100km, and the same number works in reverse. Useful anchors worth memorizing are roughly 235 ÷ 30 ≈ 7.8 L/100km for an efficient sedan, 235 ÷ 20 ≈ 11.8 for a thirsty SUV, and 235 ÷ 50 ≈ 4.7 for a hybrid.
The most common mistake is mixing up US and Imperial (UK) gallons: a UK gallon is 4.546 liters, so its constant is about 282.5, not 235.2 — using the wrong one inflates your result by roughly 20%. Also remember the relationship is non-linear, so you cannot average two L/100km figures by averaging the MPG numbers, and a 5-MPG gain at the low end saves far more fuel than the same 5-MPG gain at the high end.
Frequently asked questions
How do you convert mpg (us) to liter/100 km?
Multiply the number of mpg (us)s by 235.2146 to get liter/100 kms. For example, 1 mpg = 235.2146 L/100km.
What is 1 mpg (us) in liter/100 kms?
1 mpg (us) equals 235.2146 liter/100 kms (1 mpg = 235.2146 L/100km).
How many mpg (us)s are in 1 liter/100 km?
There are 235.2146 mpg (us)s in 1 liter/100 km.
Is this converter free and private?
Yes. It runs entirely in your browser, so your inputs never leave your device, there is no sign-up, and it works offline once loaded.
Are the conversions exact?
Conversions use internationally defined factors and are exact where the definitions are exact (for example, 1 inch = 2.54 cm). Displayed results are rounded for readability.
People also ask
What is a good MPG in L/100km?
A reasonably efficient car around 30 MPG (US) works out to about 7.8 L/100km (235.2146 ÷ 30). Anything under roughly 6 L/100km (about 39 MPG) is considered very economical.
How do I convert 40 MPG to L/100km?
Divide 235.2146 by 40, which gives about 5.88 L/100km. So 40 MPG (US) equals roughly 5.9 liters per 100 kilometers.
Why is the MPG to L/100km conversion a division instead of multiplication?
Because the two units measure efficiency in opposite directions: MPG is distance per unit of fuel while L/100km is fuel per unit of distance. To invert that relationship you divide the constant 235.2146 by the MPG value.
Is the conversion different for UK (Imperial) gallons?
Yes. The US-gallon constant is 235.2146, but for Imperial MPG you divide 282.481 by the MPG value because a UK gallon (4.546 L) is larger than a US gallon (3.785 L). Using the wrong constant overstates results by about 20%.
What is 25 MPG in L/100km?
235.2146 ÷ 25 equals about 9.41 L/100km. A 25-MPG vehicle therefore consumes roughly 9.4 liters per 100 kilometers.
Does a higher L/100km mean better fuel economy?
No, it means worse economy. L/100km measures how much fuel you burn per distance, so lower numbers are better — the opposite of MPG, where higher is better.
Can I just average two L/100km numbers from two MPG figures?
No, the conversion is non-linear, so averaging MPG values and then converting gives a different answer than converting each first. For combined fuel use, convert each MPG figure to L/100km separately, then weight by distance driven.
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