L/100km to MPG (UK) Converter
Enter a value below to convert liters per 100 km to UK miles per gallon. Fuel economy is reciprocal, so you divide: mpg (UK) = 282.4809 / L/100km - for example 8 L/100km is 35.31 mpg (UK). For the opposite direction, use our mpg (UK) to L/100km converter.
8 L/100km = 35.31 mpg (UK). Convert liters per 100 km to UK miles per gallon. Need the reverse? See mpg (UK) to L/100km.
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.
UK miles per gallon
- Definition
- UK miles per gallon (symbol: mpg (UK)) is a measure of fuel economy: the distance in miles a vehicle travels on one Imperial gallon of fuel (4.546 liters). A higher number means a more efficient car, making it the reciprocal of L/100km.
- History / origin
- It is built from the Imperial gallon and the statute mile. The UK (Imperial) gallon of 4.546 liters is larger than the US gallon of 3.785 liters, so UK MPG figures are always higher than the US MPG figure for the same car.
- Current use
- UK MPG is the traditional fuel-economy unit in Britain, still widely quoted in motoring press, used-car listings and everyday conversation even though official ratings are now published in L/100km.
Liters per 100 km to UK MPG conversion table
| Liters per 100 km [L/100km] | UK miles per gallon [mpg (UK)] |
|---|---|
| 3 L/100km | 94.1603121106 mpg (UK) |
| 4 L/100km | 70.620234083 mpg (UK) |
| 5 L/100km | 56.4961872664 mpg (UK) |
| 6 L/100km | 47.0801560553 mpg (UK) |
| 7 L/100km | 40.354419476 mpg (UK) |
| 8 L/100km | 35.3101170415 mpg (UK) |
| 9 L/100km | 31.3867707035 mpg (UK) |
| 10 L/100km | 28.2480936332 mpg (UK) |
| 12 L/100km | 23.5400780277 mpg (UK) |
| 15 L/100km | 18.8320624221 mpg (UK) |
| 20 L/100km | 14.1240468166 mpg (UK) |
| 25 L/100km | 11.2992374533 mpg (UK) |
Popular liters per 100 km to UK MPG conversions
Everyday fuel-economy figures, rounded to two decimals - the kind of numbers you meet on real car specifications.
| Liters per 100 km [L/100km] | UK miles per gallon [mpg (UK)] |
|---|---|
| 4 L/100km | 70.62 mpg (UK) |
| 5 L/100km | 56.50 mpg (UK) |
| 6 L/100km | 47.08 mpg (UK) |
| 7 L/100km | 40.35 mpg (UK) |
| 8 L/100km | 35.31 mpg (UK) |
| 9 L/100km | 31.39 mpg (UK) |
| 10 L/100km | 28.25 mpg (UK) |
| 12 L/100km | 23.54 mpg (UK) |
| 15 L/100km | 18.83 mpg (UK) |
| 18 L/100km | 15.69 mpg (UK) |
| 20 L/100km | 14.12 mpg (UK) |
| 25 L/100km | 11.30 mpg (UK) |
How to convert L/100km to MPG (UK)
To convert L/100km to UK MPG, divide 282.4809 by the L/100km value. Fuel economy is a reciprocal measure - a car that burns fewer liters per 100 km travels more miles per gallon - so you divide instead of multiplying. For example, 8 L/100km = 282.4809 / 8 = 35.31 mpg (UK).
The constant 282.4809 comes from the Imperial gallon (4.54609 liters) and the mile (1.609344 km). The same constant works in both directions:
mpg (UK) = 282.4809363 / L/100km
L/100km = 282.4809363 / mpg (UK)
Example. A car rated at 5 L/100km does 282.4809 / 5 = 56.50 mpg (UK), while a thirstier 12 L/100km does 282.4809 / 12 = 23.54 mpg (UK).
When you need to convert L/100km to MPG (UK)
Drivers and buyers move between liters per 100 km and UK miles per gallon whenever metric and Imperial figures meet. Common cases:
- Reading a new car's official L/100km fuel-economy rating as a familiar UK MPG number.
- Comparing a manufacturer's metric spec against the MPG figures quoted in the British motoring press.
- Working out the real MPG of a hire car whose trip computer only shows L/100km.
- Translating a continental model's L/100km claim into UK MPG to compare two cars fairly.
- Budgeting fuel for a road trip when the brochure quotes liters per 100 km.
Frequently asked questions
How do I convert liters per 100 km to UK miles per gallon?
Divide 282.4809 by the L/100km figure. For example, 8 L/100km equals 282.4809 / 8 = 35.31 mpg (UK). The relationship is reciprocal, so a lower L/100km means a higher MPG.
What is 8 L/100km in mpg (UK)?
8 L/100km is about 35.31 mpg (UK), found by dividing 282.4809 by 8. Measured in US gallons the same car is 29.40 mpg (US), because the US gallon is smaller.
What is the L/100km to mpg (UK) formula?
The formula is mpg (UK) = 282.4809363 / L/100km. 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 the UK (Imperial) gallon of 4.546 liters, not the US gallon of 3.785 liters. Because the Imperial gallon is larger, UK MPG figures are always higher than US MPG for the same car.
What is a good L/100km figure in mpg (UK)?
Around 5 to 6 L/100km, or about 47 to 56 mpg (UK), is efficient for a modern petrol car. 8 L/100km is roughly 35 mpg (UK), while over 12 L/100km, under 24 mpg (UK), is thirsty.
How do I convert mpg (UK) back to L/100km?
Divide 282.4809 by the MPG value, or use our mpg (UK) to L/100km converter. For example, 35 mpg (UK) is 282.4809 / 35 = 8.07 L/100km.
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