Convert MPG (US) to Kilometers per Liter (mpg to km/L)
1 mile per US gallon (mpg) = 0.4251437074 kilometers per liter (km/L). 1 km/L = 2.352145833 mpg. Example: 15 mpg = 15 × 0.4251437074 = 6.377155611 km/L.
Also searched as miles per US gallon to km/L, miles per US gallon in km/L, miles per US gallon into kilometers per liter, mpg to km/L, mpg in kilometers per liter, mpg into kilometer per liter, mile per US gallon to kilometer per liter, mpg to kilometers per liter converter, miles per US gallon to kilometres per litre and how many kilometers per liter in a mile per US gallon.
1 mpg = 0.4251437074 km/L
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk mile per US gallon to kilometer per liter converter to paste a column from Excel.
How to Convert MPG (US) to Kilometer per Liter
- 1 mpg = 0.4251437074 km/L
- 1 km/L = 2.352145833 mpg
- Example: convert 15 mpg to km/L: 15 mpg = 15 × 0.4251437074 km/L = 6.377155611 km/L
Formula
km/L = mpg × 0.4251437074303
or km/L = mpg ÷ 2.352145833333
Derivation from SI units:
- 1 mpg (US) = 1.609344 km ÷ 3.785411784 L = 0.425143707… km/L.
- Distance in kilometres travelled on one litre of fuel.
Both units are defined exactly, so the factor is exact. MPG (US) definition: mile per US gallon; Kilometer per Liter definition: kilometer per liter.
Worked examples
- A reading of 30 mpg converts to 12.75431122 km/L.
30 mpg × 0.4251437074 = 12.75431122 km/L - A value of 45 mpg is 19.13146683 km/L.
45 mpg × 0.4251437074 = 19.13146683 km/L
MPG (US) to Kilometer per Liter conversion table
| MPG (US) (mpg) | Kilometers per Liter (km/L) |
|---|---|
| 15 mpg | 6.377155611 km/L |
| 20 mpg | 8.502874149 km/L |
| 25 mpg | 10.62859269 km/L |
| 30 mpg | 12.75431122 km/L |
| 35 mpg | 14.88002976 km/L |
| 40 mpg | 17.0057483 km/L |
| 45 mpg | 19.13146683 km/L |
| 50 mpg | 21.25718537 km/L |
| 60 mpg | 25.50862245 km/L |
| 100 mpg | 42.51437074 km/L |
Where it's used
MPG (US) are used for EPA fuel economy ratings, while kilometers per liter appear in car mileage in India (kmpl), Japan and Brazil. Both measure fuel economy (distance per volume of fuel), so the conversion is a fixed factor.
MPG (US) to other fuel economy units
| Conversion | 1 mpg equals |
|---|---|
| mile per US gallon to kilometer per liter | 0.4251437074 km/L |
| mile per US gallon to liter per 100 kilometers | 235.2145833 L/100 km |
| mile per US gallon to mile per imperial gallon | 1.200949926 mpg (UK) |
Frequently asked questions
How many kilometers per liter are in 1 mile per US gallon?
1 mpg = 0.4251437074 km/L.
How do I convert miles per US gallon to kilometers per liter?
Multiply the value in mpg by 0.4251437074, or divide it by 2.352145833. For example, 15 mpg × 0.4251437074 = 6.377155611 km/L.
Is the mpg to km/L 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.S.)".
- 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 (US) to Kilometers per Liter (mpg to km/L). Retrieved October 25, 2026, from https://scientificconverters.com/fuel-economy/miles-per-gallon-to-kilometers-per-liter/
IEEE
Scientific Converters, "Convert MPG (US) to Kilometers per Liter (mpg to km/L)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/fuel-economy/miles-per-gallon-to-kilometers-per-liter/