This miles per gallon to liters per 100 kilometers converter switches between the two common ways of expressing fuel economy. Miles per gallon are a US customary unit; liters per 100 kilometers are part of the metric system used in most countries. The scales are inverse: a higher mpg figure is better, while a lower L/100 km figure is better, so 20 mpg equals 11.7607 L/100 km and 40 mpg equals 5.88036 L/100 km.
The formula is L/100 km = 235.215 ÷ mpg, using the US gallon (3.785 liters). UK miles per imperial gallon are about 20 percent higher for the same car, so check which gallon a figure uses before comparing. Everything is computed in your browser.
mpg to L/100 km formula
L/100 km = 235.215 ÷ mpg
Miles per gallon to Liters per 100 kilometers conversion table
| miles per gallon | liters per 100 kilometers | Rounded |
|---|---|---|
| 5 mpg | 47.0429 L/100 km | 47 |
| 6 mpg | 39.2024 L/100 km | 39.2 |
| 7 mpg | 33.6021 L/100 km | 33.6 |
| 8 mpg | 29.4018 L/100 km | 29.4 |
| 9 mpg | 26.135 L/100 km | 26.1 |
| 10 mpg | 23.5215 L/100 km | 23.5 |
| 12 mpg | 19.6012 L/100 km | 19.6 |
| 15 mpg | 15.681 L/100 km | 15.7 |
| 20 mpg | 11.7607 L/100 km | 11.8 |
| 25 mpg | 9.40858 L/100 km | 9.41 |
| 30 mpg | 7.84049 L/100 km | 7.84 |
| 35 mpg | 6.72042 L/100 km | 6.72 |
| 40 mpg | 5.88036 L/100 km | 5.88 |
| 45 mpg | 5.22699 L/100 km | 5.23 |
| 50 mpg | 4.70429 L/100 km | 4.7 |
| 60 mpg | 3.92024 L/100 km | 3.92 |
| 70 mpg | 3.36021 L/100 km | 3.36 |
| 80 mpg | 2.94018 L/100 km | 2.94 |
| 100 mpg | 2.35215 L/100 km | 2.35 |
Frequently asked questions
How many liters per 100 kilometers are in 30 miles per gallon?
30 mpg = 7.84049 L/100 km. Divide 235.215 by 30. The converter on this page does the same arithmetic for any value, including decimals.
What is the formula to convert miles per gallon to liters per 100 kilometers?
L/100 km = 235.215 ÷ mpg. The two units are reciprocal, which is why doubling one halves the other. Worked example: 8 mpg = 29.4018 L/100 km.
Is 50 mpg the same as 4.70429 L/100 km?
Yes. 50 mpg = 4.70429 L/100 km. Rounded to four decimals it is 4.704 L/100 km.
How do I convert liters per 100 kilometers back to miles per gallon?
The same formula works in both directions because the units are reciprocal: mpg = 235.215 ÷ L/100 km. The reverse page linked above has a table for L/100 km values.