The short answer
- L/100 km = 235.2145833 ÷ mpg (US)
- 30 mpg (US) = 7.840486 L/100 km
Worked example30 mpg (US) = 7.840486 L/100 km
UNIT CONVERSION
← Fuel economy converterMiles per US gallon to litres per 100 km
To convert miles per US gallon to litres per 100 km, use L/100 km = 235.2145833 ÷ mpg (US).
What the units mean
Mile per us gallon. Miles per US gallon measures distance per unit of fuel, so a higher number is more efficient. UK figures use the larger imperial gallon, so the same car shows a higher UK mpg.
Litre per 100 km. Litres per 100 kilometres measures fuel used per distance, so a lower number is more efficient.
Miles per US gallon to litres per 100 km table
| Miles per us gallon (mpg (US)) | Litres per 100 km (L/100 km) |
|---|---|
| 10 | 23.52146 |
| 12 | 19.60122 |
| 15 | 15.68097 |
| 18 | 13.06748 |
| 20 | 11.76073 |
| 22 | 10.69157 |
| 25 | 9.408583 |
| 28 | 8.400521 |
| 30 | 7.840486 |
| 32 | 7.350456 |
| 35 | 6.720417 |
| 40 | 5.880365 |
| 45 | 5.226991 |
| 50 | 4.704292 |
| 55 | 4.276629 |
| 60 | 3.920243 |
Values are rounded to 7 significant figures.
Common questions
How do I convert miles per US gallon to litres per 100 km?
Use L/100 km = 235.2145833 ÷ mpg (US). For example, 30 mpg (US) = 7.840486 L/100 km.
What is 30 mpg (US) in L/100 km?
30 mpg (US) is 7.840486 L/100 km.
Is this conversion exact?
Yes. Both units have exact legal definitions, so the factor is exact. Values on this page are rounded to 7 significant figures.