MPG (UK) to L/100km Converter
Enter a value below to convert UK miles per gallon to liters per 100 km. Fuel economy is reciprocal, so you divide: L/100km = 282.4809 / mpg (UK) - for example 40 mpg (UK) is 7.06 L/100km. For the opposite direction, use our L/100km to mpg (UK) converter.
40 mpg (UK) = 7.06 L/100km. Convert UK miles per gallon to liters per 100 km. Need the reverse? See L/100km to mpg (UK).
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 a UK MPG figure is always higher than the US MPG figure for the same car.
- Current use
- UK MPG is the traditional fuel-economy unit in the United Kingdom and Ireland, still widely quoted in motoring press and by drivers even though official figures are now published in 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 MPG to liters per 100 km conversion table
| UK miles per gallon [mpg (UK)] | Liters per 100 km [L/100km] |
|---|---|
| 20 mpg (UK) | 14.1240468166 L/100km |
| 25 mpg (UK) | 11.2992374533 L/100km |
| 30 mpg (UK) | 9.4160312111 L/100km |
| 35 mpg (UK) | 8.0708838952 L/100km |
| 40 mpg (UK) | 7.0620234083 L/100km |
| 45 mpg (UK) | 6.2773541407 L/100km |
| 50 mpg (UK) | 5.6496187266 L/100km |
| 55 mpg (UK) | 5.1360170242 L/100km |
| 60 mpg (UK) | 4.7080156055 L/100km |
| 70 mpg (UK) | 4.0354419476 L/100km |
Popular UK 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.
| UK miles per gallon [mpg (UK)] | Liters per 100 km [L/100km] |
|---|---|
| 25 mpg (UK) | 11.30 L/100km |
| 30 mpg (UK) | 9.42 L/100km |
| 35 mpg (UK) | 8.07 L/100km |
| 40 mpg (UK) | 7.06 L/100km |
| 45 mpg (UK) | 6.28 L/100km |
| 50 mpg (UK) | 5.65 L/100km |
| 55 mpg (UK) | 5.14 L/100km |
| 60 mpg (UK) | 4.71 L/100km |
| 70 mpg (UK) | 4.04 L/100km |
| 80 mpg (UK) | 3.53 L/100km |
How to convert MPG (UK) to L/100km
To convert UK MPG to L/100km, divide 282.4809 by the mpg (UK) 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, 40 mpg (UK) = 282.4809 / 40 = 7.06 L/100km.
The constant 282.4809 comes from the UK (Imperial) gallon (4.54609 liters) and the mile (1.609344 km). The same constant works in both directions:
L/100km = 282.4809363 / mpg (UK)
mpg (UK) = 282.4809363 / L/100km
Example. A car rated at 60 mpg (UK) does 282.4809 / 60 = 4.71 L/100km, while a thirstier 35 mpg (UK) does 282.4809 / 35 = 8.07 L/100km.
When you need to convert MPG (UK) to L/100km
Drivers and buyers move between UK miles per gallon and liters per 100 km whenever Imperial and metric figures meet. Common cases:
- Reading a UK car's mpg (UK) fuel-economy rating as the L/100km figure used across Europe.
- Comparing a British spec sheet against a Continental model quoted in liters per 100 km.
- Setting up a trip computer in L/100km when you are used to thinking in UK MPG.
- Translating a UK magazine's mpg (UK) claim into L/100km to compare two cars fairly.
- Budgeting fuel for a drive abroad when the brochure quotes liters per 100 km.
Frequently asked questions
How do I convert UK miles per gallon to liters per 100 km?
Divide 282.4809 by the mpg (UK) figure. For example, 40 mpg (UK) equals 282.4809 / 40 = 7.06 L/100km. The relationship is reciprocal, so a higher MPG means a lower L/100km.
What is 40 mpg (UK) in L/100km?
40 mpg (UK) is about 7.06 L/100km, found by dividing 282.4809 by 40. The same Imperial figure in US units is roughly 33.31 mpg (US).
What is the mpg (UK) to L/100km formula?
The formula is L/100km = 282.4809 / mpg (UK). 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, a UK MPG figure is always higher than the US MPG figure for the same car.
What is a good mpg (UK) figure in L/100km?
Around 50 to 60 mpg (UK), or about 5.65 to 4.71 L/100km, is efficient for a modern petrol car. 40 mpg (UK) is roughly 7.06 L/100km, while under 30 mpg (UK), over 9.4 L/100km, is thirsty.
How do I convert L/100km back to mpg (UK)?
Divide 282.4809 by the L/100km value, or use our L/100km to mpg (UK) converter. For example, 7.06 L/100km is 282.4809 / 7.06 = 40.01 mpg (UK).
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