MPG (US) to L/100km Converter
Enter a value below to convert US miles per gallon to liters per 100 km. Fuel economy is reciprocal, so you divide: L/100km = 235.2146 / mpg (US) - for example 30 mpg (US) is 7.84 L/100km. For the opposite direction, use our L/100km to mpg (US) converter.
30 mpg (US) = 7.84 L/100km. Convert US miles per gallon to liters per 100 km. Need the reverse? See L/100km to mpg (US).
US miles per gallon
- Definition
- US miles per gallon (symbol: mpg (US)) is a measure of fuel economy: the distance in miles a vehicle travels on one US gallon of fuel (3.785 liters). A higher number means a more efficient car, which makes it the reciprocal of L/100km.
- History / origin
- It is built from the US customary gallon and the statute mile. The US gallon is smaller than the Imperial (UK) gallon of 4.546 liters, so US MPG figures are always lower than the UK MPG figure for the same car.
- Current use
- US MPG is the standard fuel-economy unit in the United States, where EPA city and highway ratings appear on every new-car window sticker and in fuel-cost comparisons.
Liters per 100 kilometers
- Definition
- Liters per 100 km (symbol: L/100km) is a measure of fuel consumption: the volume of fuel, in liters, a vehicle burns to travel 100 kilometers. Because the distance is fixed and the fuel varies, a lower number means a more efficient car - the opposite sense to MPG.
- History / origin
- It is the metric standard for fuel economy, defined from the liter and the kilometer. As Europe and most of the world moved to SI units, L/100km replaced miles-per-gallon style figures on car specifications and dashboards.
- Current use
- L/100km is the official fuel-economy unit across Europe, Australia, New Zealand, South Africa and much of Asia, quoted on manufacturer brochures, window stickers and trip computers.
US MPG to liters per 100 km conversion table
| US miles per gallon [mpg (US)] | Liters per 100 km [L/100km] |
|---|---|
| 15 mpg (US) | 15.6809722222 L/100km |
| 20 mpg (US) | 11.7607291667 L/100km |
| 25 mpg (US) | 9.4085833333 L/100km |
| 30 mpg (US) | 7.8404861111 L/100km |
| 35 mpg (US) | 6.7204166667 L/100km |
| 40 mpg (US) | 5.8803645833 L/100km |
| 45 mpg (US) | 5.2269907407 L/100km |
| 50 mpg (US) | 4.7042916667 L/100km |
| 60 mpg (US) | 3.9202430556 L/100km |
| 70 mpg (US) | 3.3602083333 L/100km |
Popular US MPG to liters per 100 km conversions
Everyday fuel-economy figures, rounded to two decimals - the kind of numbers you meet on real car specifications.
| US miles per gallon [mpg (US)] | Liters per 100 km [L/100km] |
|---|---|
| 20 mpg (US) | 11.76 L/100km |
| 25 mpg (US) | 9.41 L/100km |
| 30 mpg (US) | 7.84 L/100km |
| 35 mpg (US) | 6.72 L/100km |
| 40 mpg (US) | 5.88 L/100km |
| 45 mpg (US) | 5.23 L/100km |
| 50 mpg (US) | 4.70 L/100km |
| 55 mpg (US) | 4.28 L/100km |
| 60 mpg (US) | 3.92 L/100km |
| 70 mpg (US) | 3.36 L/100km |
How to convert MPG (US) to L/100km
To convert US MPG to L/100km, divide 235.2146 by the mpg (US) value. Fuel economy is a reciprocal measure - a car that travels more miles per gallon burns fewer liters per 100 km - so you divide instead of multiplying. For example, 30 mpg (US) = 235.2146 / 30 = 7.84 L/100km.
The constant 235.2146 comes from the US gallon (3.785411784 liters) and the mile (1.609344 km). The same constant works in both directions:
L/100km = 235.2145833 / mpg (US)
mpg (US) = 235.2145833 / L/100km
Example. A car rated at 50 mpg (US) does 235.2146 / 50 = 4.70 L/100km, while a thirstier 20 mpg (US) does 235.2146 / 20 = 11.76 L/100km.
When you need to convert MPG (US) to L/100km
Drivers and buyers move between US miles per gallon and liters per 100 km whenever US and metric figures meet. Common cases:
- Reading a US-market EPA MPG rating as a familiar European L/100km number.
- Comparing a US-spec model against an imported car's L/100km brochure figure.
- Setting a metric trip computer's target when you only know the car's US MPG rating.
- Translating a manufacturer's US MPG claim into L/100km to compare two cars fairly.
- Budgeting fuel for a trip abroad where pumps and specs are quoted in liters.
Frequently asked questions
How do I convert US miles per gallon to liters per 100 km?
Divide 235.2146 by the mpg (US) figure. For example, 30 mpg (US) equals 235.2146 / 30 = 7.84 L/100km. The relationship is reciprocal, so a higher MPG means a lower L/100km.
What is 30 mpg (US) in L/100km?
30 mpg (US) is about 7.84 L/100km, found by dividing 235.2146 by 30. The same car measured in Imperial gallons is roughly 36.03 mpg (UK).
What is the mpg (US) to L/100km formula?
The formula is L/100km = 235.2146 / mpg (US). Because the two units are reciprocal measures of the same fuel use, you divide rather than multiply, and the same constant converts back the other way.
Is this the US or UK gallon?
This page uses US MPG, based on the US gallon of 3.785 liters. The Imperial (UK) gallon is larger at 4.546 liters, so UK MPG figures are higher than US MPG for the same car. For Imperial input use our mpg (UK) to L/100km converter.
What is a good mpg (US) figure in L/100km?
Around 40 to 50 mpg (US), or about 4.70 to 5.88 L/100km, is efficient for a modern petrol car. 30 mpg (US) is roughly 7.84 L/100km, while under 20 mpg (US), over 11.76 L/100km, is thirsty.
How do I convert L/100km back to mpg (US)?
Divide 235.2146 by the L/100km value, or use our L/100km to mpg (US) converter. For example, 7.84 L/100km is 235.2146 / 7.84 = 30 mpg (US).
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