How to convert 12 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 ÷ 12 = 19.60
The constant 235.215 comes from 100 km ÷ 1.609344 km per mile × 3.785411 liters per US gallon.
What 12 mpg means in practice
| Fuel per 100 miles | 8.33 gallons |
| Fuel per 100 km | 19.60 liters |
| Fuel for 12,000 miles a year | 1,000 gallons |
| Fuel cost for 12,000 miles at $3.20/gal | $3,200 |
| CO₂ per mile (gasoline) | 741 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 12 mpg good?
This is low fuel economy, typical of large pickup trucks, full-size SUVs, vans and older V8 cars.
Values around 12 mpg
| US mpg | L/100 km | UK mpg | km/L |
|---|---|---|---|
| 10 mpg | 23.52 L/100 km | 12.0 UK mpg | 4.25 km/L |
| 11 mpg | 21.38 L/100 km | 13.2 UK mpg | 4.68 km/L |
| 12 mpg | 19.60 L/100 km | 14.4 UK mpg | 5.10 km/L |
| 13 mpg | 18.09 L/100 km | 15.6 UK mpg | 5.53 km/L |
| 14 mpg | 16.80 L/100 km | 16.8 UK mpg | 5.95 km/L |
| 15 mpg | 15.68 L/100 km | 18.0 UK mpg | 6.38 km/L |
| 16 mpg | 14.70 L/100 km | 19.2 UK mpg | 6.80 km/L |
Frequently asked questions
What is 12 mpg in L/100 km?
12 US mpg equals 19.60 L/100 km (235.215 ÷ 12).
What is 12 mpg in km/L?
12 US mpg equals 5.10 kilometers per liter.
Is 12 mpg good?
This is low fuel economy, typical of large pickup trucks, full-size SUVs, vans and older V8 cars.
What is 12 US mpg in UK mpg?
12 US mpg equals 14.4 imperial (UK) mpg.
Last updated November 10, 2026