MPG to L/100km
Convert mpg (us) to liter/100 km instantly — type a value and read the result, with the exact formula shown.
Reviewed by the CalcCafe editorial team · Last updated 1 July 2026 · How we test our tools
Example
1 mpg = 235.2146 L/100km, 5 mpg = 47.04292 L/100km, 10 mpg = 23.52146 L/100km.
Common conversions: mpg (us) to liter/100 km
Quick reference for the mpg → L/100km values you are most likely to need, computed with the exact factor the converter above uses. It includes the specific values people most often look up (35 mpg, 30 mpg, 100 mpg, 40 mpg, 20 mpg). See also the reverse converter: Liter/100 km to MPG (US).
| MPG (US) (mpg) | Liter/100 km (L/100km) |
|---|
| 1 mpg | 235.2146 L/100km |
| 2 mpg | 117.6073 L/100km |
| 3 mpg | 78.4049 L/100km |
| 5 mpg | 47.0429 L/100km |
| 10 mpg | 23.5215 L/100km |
| 15 mpg | 15.681 L/100km |
| 20 mpg | 11.7607 L/100km |
| 22 mpg | 10.6916 L/100km |
| 25 mpg | 9.4086 L/100km |
| 30 mpg | 7.8405 L/100km |
| 35 mpg | 6.7204 L/100km |
| 40 mpg | 5.8804 L/100km |
| 50 mpg | 4.7043 L/100km |
| 60 mpg | 3.9202 L/100km |
| 70 mpg | 3.3602 L/100km |
| 75 mpg | 3.1362 L/100km |
| 80 mpg | 2.9402 L/100km |
| 90 mpg | 2.6135 L/100km |
| 100 mpg | 2.3521 L/100km |
| 150 mpg | 1.5681 L/100km |
| 200 mpg | 1.1761 L/100km |
| 250 mpg | 0.940858 L/100km |
| 500 mpg | 0.470429 L/100km |
| 1,000 mpg | 0.235215 L/100km |
Liter/100 km to MPG (US)
| Liter/100 km (L/100km) | MPG (US) (mpg) |
|---|
| 1 L/100km | 235.2146 mpg |
| 5 L/100km | 47.0429 mpg |
| 10 L/100km | 23.5215 mpg |
| 50 L/100km | 4.7043 mpg |
| 100 L/100km | 2.3521 mpg |
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.
What is 20 MPG in litres?
20 mpg (US) equals 235.215 ÷ 20 = 11.76 liters per 100 km. Put another way, the car travels about 8.5 km on each liter, since 20 miles × 1.609344 ÷ 3.785412 = 8.50 km/L. That is a fairly thirsty figure, typical of large SUVs and trucks.
How many mpg does 6 liters per 100 km equal in Canada?
6 L/100km is 235.215 ÷ 6 = 39.2 mpg in US gallons, or 282.481 ÷ 6 = 47.1 mpg in imperial gallons. Canada officially rates vehicles in L/100km, but when Canadians quote mpg they have traditionally used the imperial gallon (4.546 L), so the 47 mpg figure is the one that matches older Canadian usage. Always check which gallon a source means, because the two differ by about 20 percent.
What is 1 gallon in litres in the UK?
One UK (imperial) gallon is exactly 4.54609 liters. The US gallon is smaller at 3.785 liters, which is why a car's UK mpg figure is about 20 percent higher than its US mpg figure for identical fuel consumption. This converter uses the US gallon, so multiply a UK mpg value by 0.8327 before entering it.
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Sources & references
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