MPG (US) to km/L (MPG (US) to km/L)
Result
0.4251437074 km/L
Formula
km/L = MPG (US) × 0.4251437074
1 MPG (US) = 0.4251437074 km/L, and 1 km/L = 2.352145833 MPG (US).
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
- 1 MPG (US) × 0.4251437074 = 0.42514371 km/L
- 10 MPG (US) × 0.4251437074 = 4.2514371 km/L
- 100 MPG (US) × 0.4251437074 = 42.514371 km/L
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 (US) to km/L table
| MPG (US) (MPG (US)) | km/L (km/L) |
|---|---|
| 1 | 0.42514371 |
| 2 | 0.85028741 |
| 5 | 2.1257185 |
| 10 | 4.2514371 |
| 20 | 8.5028741 |
| 50 | 21.257185 |
| 100 | 42.514371 |
| 1,000 | 425.14371 |
The units
- MPG (US) (MPG (US))
- A unit of automotive.
- km/L (km/L)
- 1 km/L = 2.352145833 MPG (US).
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