How to convert 25 mpg to L/100 km
Liters per 100 km is the inverse of miles per gallon, so you divide a constant by the mpg value:
L/100 km = 235.215 ÷ 25 = 9.41
The constant 235.215 comes from 100 km ÷ 1.609344 km per mile × 3.785411 liters per US gallon.
What 25 mpg means in practice
| Fuel per 100 miles | 4.00 gallons |
| Fuel per 100 km | 9.41 liters |
| Fuel for 12,000 miles a year | 480 gallons |
| Fuel cost for 12,000 miles at $3.20/gal | $1,536 |
| CO₂ per mile (gasoline) | 355 g |
CO₂ is based on the EPA figure of 8,887 grams of CO₂ per gallon of gasoline. For your own trip costs, use the fuel cost calculator.
Is 25 mpg good?
This is average fuel economy for many SUVs, crossovers and larger sedans.
Values around 25 mpg
| US mpg | L/100 km | UK mpg | km/L |
|---|---|---|---|
| 21 mpg | 11.20 L/100 km | 25.2 UK mpg | 8.93 km/L |
| 22 mpg | 10.69 L/100 km | 26.4 UK mpg | 9.35 km/L |
| 23 mpg | 10.23 L/100 km | 27.6 UK mpg | 9.78 km/L |
| 24 mpg | 9.80 L/100 km | 28.8 UK mpg | 10.20 km/L |
| 25 mpg | 9.41 L/100 km | 30.0 UK mpg | 10.63 km/L |
| 26 mpg | 9.05 L/100 km | 31.2 UK mpg | 11.05 km/L |
| 27 mpg | 8.71 L/100 km | 32.4 UK mpg | 11.48 km/L |
| 28 mpg | 8.40 L/100 km | 33.6 UK mpg | 11.90 km/L |
| 29 mpg | 8.11 L/100 km | 34.8 UK mpg | 12.33 km/L |
Frequently asked questions
What is 25 mpg in L/100 km?
25 US mpg equals 9.41 L/100 km (235.215 ÷ 25).
What is 25 mpg in km/L?
25 US mpg equals 10.63 kilometers per liter.
Is 25 mpg good?
This is average fuel economy for many SUVs, crossovers and larger sedans.
What is 25 US mpg in UK mpg?
25 US mpg equals 30.0 imperial (UK) mpg.
Last updated November 10, 2026