Liters per 100 km to MPG (L/100km to mpg)
mpg (US) = 235.215 ÷ L/100km
| liters per 100 km | miles per gallon (US) |
|---|---|
| 4 L/100km | 58.8 mpg (US) |
| 5 L/100km | 47.04 mpg (US) |
| 6 L/100km | 39.2 mpg (US) |
| 7 L/100km | 33.6 mpg (US) |
| 8 L/100km | 29.4 mpg (US) |
| 9 L/100km | 26.13 mpg (US) |
| 10 L/100km | 23.52 mpg (US) |
| 12 L/100km | 19.6 mpg (US) |
| 15 L/100km | 15.68 mpg (US) |
| 20 L/100km | 11.76 mpg (US) |
UK (imperial) mpg = 282.481 ÷ L/100km: 5 L/100km = 56.50 UK mpg, 8 L/100km = 35.31 UK mpg.
The conversion works the same way in both directions because the units are reciprocals: US mpg = 235.215 ÷ L/100km. The constant is 100 × 3.785411784 ÷ 1.609344, from the exact US gallon and international mile in NIST SP 811.
Formula
mpg (US) = 235.215 ÷ L/100km
Example: 4.5 liters per 100 km = 52.2699 miles per gallon (US).
Liters per 100 km to MPG chart
| liters per 100 km | miles per gallon (US) |
|---|---|
| 3 | 78.4049 |
| 3.5 | 67.2042 |
| 4 | 58.8036 |
| 4.5 | 52.2699 |
| 5 | 47.0429 |
| 5.5 | 42.7663 |
| 6 | 39.2024 |
| 6.5 | 36.1869 |
| 7 | 33.6021 |
| 7.5 | 31.3619 |
| 8 | 29.4018 |
| 9 | 26.135 |
| 10 | 23.5215 |
| 11 | 21.3831 |
| 12 | 19.6012 |
| 14 | 16.801 |
| 15 | 15.681 |
| 18 | 13.0675 |
| 20 | 11.7607 |
Good to know
Reading a European, Canadian or Australian spec: those markets quote fuel use in L/100km. 5 L/100km is 47.0 US mpg, 7 L/100km is 33.6 mpg and 10 L/100km is 23.5 mpg.
For UK mpg divide 282.481 instead: 6 L/100km = 47.1 UK mpg but 39.2 US mpg. The 20% gap is just the bigger imperial gallon, not a better car.
Electric and hybrid comparisons: official EV efficiency is published in other units (kWh/100 km or MPGe), so this formula only applies to liquid fuel. For km per litre, 100 ÷ L/100km; for all four units at once, use the fuel economy converter.
Frequently asked questions
How do you convert L/100km to mpg?
Divide 235.215 by the L/100km figure for US mpg (or 282.481 for UK mpg). 8 L/100km → 29.40 US mpg.
What is 6 L/100km in mpg?
6 L/100km is 39.20 US mpg, or 47.08 UK mpg.
What is 10 L/100km in mpg?
10 L/100km is 23.52 US mpg.
Is 5 L/100km good fuel economy?
5 L/100km is 47.0 US mpg — economical for a petrol car; many hybrids are in this range.