Fuel Economy L100km To Mpg
Calculator
Results
- Miles per gallon (US)
- 31.361944
- Miles per gallon (imperial)
- 37.664124
- Kilometres per litre
- 13.333333
- Miles per litre
- 8.284949
Conversion results
| Miles per gallon (US) | 31.361944 |
| Miles per gallon (imperial) | 37.664124 |
| Kilometres per litre | 13.333333 |
| Miles per litre | 8.284949 |
formula-map diagram
- Miles per gallon (US)
- 31.361944
- Miles per gallon (imperial)
- 37.664124
- Kilometres per litre
- 13.333333
- Miles per litre
- 8.284949
Unit relationship
Formula
mpg(US) = 378.5411784 × 100 ÷ (1.609344 × L/100 km)= 31.361944444444
Note
This result is a simplified model: it converts the single value you entered with the exact factors shown, and rounds to the display precision. It does not know your measurement's accuracy, and cooking or density conversions depend on how an ingredient is packed. Check critical figures against the original units.
More in Unit conversions
See all →Frequently asked questions
Why is the relationship between L/100km and mpg not a simple multiplication?+
Because L/100km measures fuel used per fixed distance while mpg measures distance travelled per fixed fuel amount — they're inversely related, not directly proportional. That's why the formula involves dividing a constant by the value rather than multiplying it.
What's the formula to convert L/100km to mpg?+
mpg (US) = 235.215 ÷ (L/100km), and mpg (UK/imperial) = 282.481 ÷ (L/100km). The two constants differ because US and imperial gallons are different sizes, so always check which mpg standard you're comparing against.
Why does a lower L/100km number mean better fuel economy, while a higher mpg number means the same thing?+
L/100km measures consumption (fuel spent per distance), so less is better — it directly answers 'how much fuel does this trip cost.' Mpg measures efficiency the other way (distance per fuel), so more is better — the two scales run in opposite directions for the same underlying performance.
Why does the same percentage improvement in L/100km not translate to the same percentage improvement in mpg?+
Because the two units are reciprocals of each other (with a constant), equal-sized changes near the low end of L/100km produce disproportionately large mpg gains, while equal-sized changes at high L/100km values move mpg only slightly — this is why fuel-saving improvements matter more on inefficient vehicles.
US mpg or UK mpg — why does it matter which I use?+
A US gallon (3.785 L) is smaller than a UK imperial gallon (4.546 L), so the same L/100km figure produces a noticeably higher mpg number under the UK standard than the US one. Mixing the two without noting which is used will make a car look more or less efficient than it actually is.