MPG (UK) to L/100km (MPG (UK) to L/100km)
Result
282.4809363 L/100km
Formula
L/100km = 282.4809363 ÷ MPG (UK)
This is an inverse relationship: a larger value in MPG (UK) gives a smaller value in L/100km.
Fuel economy is converted through the US gallon (3.785411784 L) and imperial gallon (4.54609 L): L/100 km = 235.215 ÷ mpg (US). Power uses mechanical horsepower and metric horsepower (PS = 735.49875 W). Torque uses 1 lb·ft = 1.3558179 N·m.
Worked examples
- 282.4809363 ÷ 1 = 282.48094 L/100km
- 282.4809363 ÷ 10 = 28.248094 L/100km
- 282.4809363 ÷ 100 = 2.8248094 L/100km
Common mistakes
- L/100 km is inverse to mpg — lower is better — so it does not scale linearly: going from 10 to 20 mpg saves far more fuel than going from 40 to 50.
- UK and US mpg differ because the imperial gallon is 20% larger: 40 mpg (UK) is 33.3 mpg (US).
- Car makers in Europe and Japan usually quote PS, not horsepower; 100 PS is 98.6 hp.
MPG (UK) to L/100km table
| MPG (UK) (MPG (UK)) | L/100km (L/100km) |
|---|---|
| 1 | 282.48094 |
| 2 | 141.24047 |
| 5 | 56.496187 |
| 10 | 28.248094 |
| 20 | 14.124047 |
| 50 | 5.6496187 |
| 100 | 2.8248094 |
| 1,000 | 0.28248094 |
The units
- MPG (UK) (MPG (UK))
- 1 MPG (UK) = 0.8326741846 MPG (US).
- L/100km (L/100km)
- A unit of automotive.
Sources for these factors
- Handbook 44 (2024), Appendix C: General Tables of Units of Measurement — NIST
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy