Convert MPG (US) to Liters per 100 km (mpg to L/100 km)
MPG (US) and liters per 100 kilometers are inversely related: L/100 km = 235.2145833 ÷ mpg, so 30 mpg = 7.840486111 L/100 km.
Also searched as mpg to l/100km, mpg to litres per 100 km, miles per gallon to liters per 100 km, us mpg to l/100km and 30 mpg in l/100km.
1 mpg = 235.2145833 L/100 km
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk mile per US gallon to liter per 100 kilometers converter to paste a column from Excel.
How to Convert MPG (US) to Liter per 100 km
- L/100 km = 235.2145833 ÷ mpg
- mpg = 235.2145833 ÷ L/100 km
- Example: convert 30 mpg to L/100 km: 235.2145833 ÷ 30 = 7.840486111 L/100 km
Formula
L/100 km = 235.2145833333 ÷ mpg
Derivation from SI units:
- 1 mpg (US) = 1.609344 km ÷ 3.785411784 L = 0.425143707… 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 = 235.2145833333 ÷ mpg (a higher mpg means a lower L/100 km)
Both units are defined exactly, so the factor is exact. MPG (US) definition: mile per US gallon; Liter per 100 km definition: liter per 100 kilometers.
Worked examples
- A car rated 30 mpg uses 7.840486111 L/100 km.
235.2145833 ÷ 30 = 7.840486111 L/100 km - An SUV rated 25 mpg uses 9.408583333 L/100 km.
235.2145833 ÷ 25 = 9.408583333 L/100 km
MPG (US) to Liter per 100 km conversion table
| MPG (US) (mpg) | Liters per 100 km (L/100 km) |
|---|---|
| 15 mpg | 15.68097222 L/100 km |
| 20 mpg | 11.76072917 L/100 km |
| 25 mpg | 9.408583333 L/100 km |
| 30 mpg | 7.840486111 L/100 km |
| 35 mpg | 6.720416667 L/100 km |
| 40 mpg | 5.880364583 L/100 km |
| 45 mpg | 5.226990741 L/100 km |
| 50 mpg | 4.704291667 L/100 km |
| 60 mpg | 3.920243056 L/100 km |
| 100 mpg | 2.352145833 L/100 km |
Where it's used
US fuel economy ratings in mpg are converted to litres per 100 km, the official unit in Canada, Australia and Europe. Because one measures distance per fuel and the other fuel per distance, divide 235.215 by the mpg.
MPG (US) to other fuel economy units
| Conversion | 1 mpg equals |
|---|---|
| mile per US gallon to liter per 100 kilometers | 235.2145833 L/100 km |
| mile per US gallon to kilometer per liter | 0.4251437074 km/L |
| mile per US gallon to mile per imperial gallon | 1.200949926 mpg (UK) |
Frequently asked questions
How do I convert mpg to L/100 km?
Divide 235.215 by the US mpg: 30 mpg = 7.840486111 L/100 km. It is a division because the units are reciprocal.
Why does a small mpg gain matter more for thirsty cars?
Going from 10 to 20 mpg saves 11.8 L/100 km, but 40 to 50 mpg saves only 1.2 L/100 km; L/100 km shows fuel used directly.
What is the formula for miles per US gallon to liters per 100 kilometers?
L/100 km = 235.2145833 ÷ mpg. The two systems are inversely related, so divide the constant by the value; do not multiply. For example, 235.2145833 ÷ 30 = 7.840486111 L/100 km.
Why does a higher mpg give a lower L/100 km?
Liters per 100 km counts length per unit mass (an indirect system), while miles per US 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 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.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 Liters per 100 km (mpg to L/100 km). Retrieved October 25, 2026, from https://scientificconverters.com/fuel-economy/miles-per-gallon-to-liters-per-100-km/
IEEE
Scientific Converters, "Convert MPG (US) to Liters per 100 km (mpg to L/100 km)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/fuel-economy/miles-per-gallon-to-liters-per-100-km/