How to convert MPG (US) to km per liter
MPG (US) and Kilometers per Liter are related by a formula rather than a single factor. Fuel economy conversions let you compare cars rated in different countries. Note that L/100 km is an inverse measure — lower is better.
MPG (US) to Kilometers per Liter conversion table
| MPG (US) (mpg) | Kilometers per Liter (km/L) |
|---|---|
| 3 mpg | 1.27543112229 km/L |
| 5 mpg | 2.12571853715 km/L |
| 8 mpg | 3.40114965944 km/L |
| 10 mpg | 4.2514370743 km/L |
| 15 mpg | 6.37715561145 km/L |
| 20 mpg | 8.50287414861 km/L |
| 25 mpg | 10.6285926858 km/L |
| 30 mpg | 12.7543112229 km/L |
| 40 mpg | 17.0057482972 km/L |
| 50 mpg | 21.2571853715 km/L |
About the units
MPG (US) (mpg)
US miles per gallon is miles traveled per US gallon (3.785 L) of fuel.
Kilometers per Liter (km/L)
Kilometers per liter is how far a vehicle travels on one liter of fuel.
How to use this converter
- Type the number of MPG (US) (mpg) in the input box.
- The result in km per liter appears instantly — no button needed.
- See the same value in every other fuel economy unit just below.
- Use “Swap units” to convert km per liter back to MPG (US).
When you’ll use the mpg (us) to kilometers per liter conversion
Converting mpg to km per liter comes up more often than you might expect — for example when fleet and delivery planning, reading European L/100 km figures, or comparing a car rated abroad with one at home. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
Watch out for these mix-ups
- L/100 km goes down as efficiency improves; mpg goes up.
- UK mpg uses the larger imperial gallon, so UK figures look higher.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many km per liter are in one mpg (us)?
0.42514370743 km/L corresponds to 1 mpg. Because this scale uses an offset or an inverse relationship, there is no single multiplication factor — use the formula above.
How do I convert MPG (US) to km per liter?
Apply the formula shown on this page, or enter your value in the converter for an instant exact answer.
What is 25 mpg in km/L?
25 mpg = 10.6285926858 km/L. Also, 10 mpg = 4.2514370743 km/L and 40 mpg = 17.0057482972 km/L.
What is the difference between a mpg (us) and a kilometers per liter?
US miles per gallon is miles traveled per US gallon (3.785 L) of fuel. Kilometers per liter is how far a vehicle travels on one liter of fuel.
Is this tool free and private?
Yes — the MPG (US) to Kilometers per Liter is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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