Convert MPG (UK) to Liters per 100 km (mpg UK to L/100 km)
MPG (UK) and liters per 100 kilometers are inversely related: L/100 km = 282.4809363 ÷ mpg (UK), so 50 mpg (UK) = 5.649618727 L/100 km.
Also searched as miles per imperial gallon to L/100 km, miles per imperial gallon in L/100 km, miles per imperial gallon into liters per 100 kilometers, mpg UK to L/100 km, mpg UK in liters per 100 kilometers, mpg UK into liter per 100 kilometers, mile per imperial gallon to liter per 100 kilometers, mpg UK to liters per 100 kilometers converter and miles per imperial gallon to litres per 100 kilometres.
1 mpg (UK) = 282.4809363 L/100 km
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk mile per imperial gallon to liter per 100 kilometers converter to paste a column from Excel.
How to Convert MPG (UK) to Liter per 100 km
- L/100 km = 282.4809363 ÷ mpg (UK)
- mpg (UK) = 282.4809363 ÷ L/100 km
- Example: convert 50 mpg (UK) to L/100 km: 282.4809363 ÷ 50 = 5.649618727 L/100 km
Formula
L/100 km = 282.4809363318 ÷ mpg (UK)
Derivation from SI units:
- 1 mpg (UK) = 1.609344 km ÷ 4.54609 L = 0.354006189… km/L.
- Fuel used in litres per 100 km; km/L = 100 ÷ (L/100 km), so the scales are reciprocal.
- Solving for L/100 km: L/100 km = 282.4809363318 ÷ mpg (UK) (a higher mpg (UK) means a lower L/100 km)
Both units are defined exactly, so the factor is exact. MPG (UK) definition: mile per imperial gallon; Liter per 100 km definition: liter per 100 kilometers.
Worked examples
- A UK car rated 50 mpg (UK) uses 5.649618727 L/100 km.
282.4809363 ÷ 50 = 5.649618727 L/100 km - A car rated 40 mpg (UK) uses 7.062023408 L/100 km.
282.4809363 ÷ 40 = 7.062023408 L/100 km
MPG (UK) to Liter per 100 km conversion table
| MPG (UK) | Liters per 100 km (L/100 km) |
|---|---|
| 20 mpg (UK) | 14.12404682 L/100 km |
| 30 mpg (UK) | 9.416031211 L/100 km |
| 35 mpg (UK) | 8.070883895 L/100 km |
| 40 mpg (UK) | 7.062023408 L/100 km |
| 45 mpg (UK) | 6.277354141 L/100 km |
| 50 mpg (UK) | 5.649618727 L/100 km |
| 55 mpg (UK) | 5.136017024 L/100 km |
| 60 mpg (UK) | 4.708015606 L/100 km |
| 70 mpg (UK) | 4.035441948 L/100 km |
| 80 mpg (UK) | 3.531011704 L/100 km |
Where it's used
UK fuel economy in miles per imperial gallon is converted to litres per 100 km for European and Australian comparisons. Divide 282.481 by the UK mpg.
MPG (UK) to other fuel economy units
| Conversion | 1 mpg (UK) equals |
|---|---|
| mile per imperial gallon to liter per 100 kilometers | 282.4809363 L/100 km |
| mile per imperial gallon to mile per US gallon | 0.8326741846 mpg |
| mile per imperial gallon to kilometer per liter | 0.3540061899 km/L |
Frequently asked questions
How do I convert UK mpg to L/100 km?
Divide 282.481 by the UK mpg: 50 mpg = 5.649618727 L/100 km.
What is the formula for miles per imperial gallon to liters per 100 kilometers?
L/100 km = 282.4809363 ÷ mpg (UK). The two systems are inversely related, so divide the constant by the value; do not multiply. For example, 282.4809363 ÷ 50 = 5.649618727 L/100 km.
Why does a higher mpg (UK) give a lower L/100 km?
Liters per 100 km counts length per unit mass (an indirect system), while miles per imperial gallon counts mass per unit length (a direct system). A finer yarn has a higher indirect number and a lower direct number.
Is the mpg (UK) to L/100 km conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "mile per gallon (U.K.)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (radian) and Table 8 (non-SI units accepted for use with the SI).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert MPG (UK) to Liters per 100 km (mpg UK to L/100 km). Retrieved October 25, 2026, from https://scientificconverters.com/fuel-economy/miles-per-gallon-uk-to-liters-per-100-km/
IEEE
Scientific Converters, "Convert MPG (UK) to Liters per 100 km (mpg UK to L/100 km)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/fuel-economy/miles-per-gallon-uk-to-liters-per-100-km/