Miles per US gallon to Kilometres per litre
Miles per US gallon to Kilometres per litre (mpg (US) to km/L) Converter
Convert from
- Miles per US gallonmpg (US)
- Litres per 100 kmL/100 km
- Miles per imperial gallon (UK)mpg (UK)
- Kilometres per litrekm/L
1 mile per US gallon = 0.42514 kilometres per litre
Default is 5 significant figures. “Units typed as” decides what words like gallon, pint or cup mean when you type them. Scientific input such as 1e15 or 2.5e-3 works in the value box; type unit names or a whole conversion in the unit picker’s search.
- 1 mpg (US) = 0.42514 km/L
- 5 mpg (US) = 2.1257 km/L
- 10 mpg (US) = 4.2514 km/L
- 25 mpg (US) = 10.629 km/L
Shortcuts: / value box · S swap · Esc close the picker · Alt+C copy · Alt+L link · Alt+F favourite
How it’s calculated
This uses the US gallon: 1 US mpg = 0.42514 km/L. For UK mpg (imperial gallon) 1 mpg = 0.35400 km/L; pick “mpg (UK)” in the unit list.
1 mpg (US) ≈ 0.42514371 km/L · 1 km/L ≈ 2.3521458 mpg (US)
km/L = mpg (US) × 0.4251437074
- Multiply the value in miles per US gallon by 0.4251437074.
- To go back, divide by 0.4251437074 (or multiply by 2.352145833).
- 1 mpg (US) = 0.4251437074 km/L · 1 km/L = 2.352145833 mpg (US)
Step by step
Find the conversion factor
By definition 1 km/L = 2.35214583333333 mpg (US). Source: Derived from exact length, volume and time definitions (NIST SP 811 / Handbook 44).
Multiply by the factor written as a fraction
Put mpg (US) in the denominator so it cancels, leaving km/L.
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 0.42514 km/L
Formula: km/L = mpg (US) × 0.4251437074. Factors last reviewed 2026-10-27.
Miles per US gallon to kilometres per litre conversion table
1 mile per US gallon = 0.42514 kilometres per litre · 1 km/L = 2.3521 mpg (US)
- 1 mile per US gallon = 0.42514 kilometres per litre
- 5 miles per US gallon = 2.1257 kilometres per litre
- 10 miles per US gallon = 4.2514 kilometres per litre
- 25 miles per US gallon = 10.629 kilometres per litre
- 100 miles per US gallon = 42.514 kilometres per litre
| Miles per US gallon (mpg (US)) | Kilometres per litre (km/L) |
|---|---|
| 10 mpg (US) | 4.2514 km/L |
| 15 mpg (US) | 6.3772 km/L |
| 20 mpg (US) | 8.5029 km/L |
| 25 mpg (US) | 10.629 km/L |
| 30 mpg (US) | 12.754 km/L |
| 35 mpg (US) | 14.88 km/L |
| 40 mpg (US) | 17.006 km/L |
| 45 mpg (US) | 19.131 km/L |
| 50 mpg (US) | 21.257 km/L |
| 60 mpg (US) | 25.509 km/L |
| 70 mpg (US) | 29.76 km/L |
FAQ
How do I convert miles per US gallon to kilometres per litre?
Use km/L = mpg (US) × 0.4251437074. Multiply the value in miles per US gallon by 0.4251437074.
How many kilometres per litre are in 1 mile per US gallon?
1 mile per US gallon (mpg (US)) equals 0.42514 kilometres per litre (km/L); more precisely 0.4251437074.
How many miles per US gallon are in 1 kilometre per litre?
1 kilometre per litre (km/L) equals 2.3521 miles per US gallon (mpg (US)); more precisely 2.352145833.
What is 10 mpg (US) in km/L?
10 miles per US gallon = 4.2514 kilometres per litre.
Is the mile per US gallon a US or a UK unit?
Unitglide uses the US customary mile per US gallon. US and UK units with the same name can differ, so check which one your source uses.
About these units
Mile per US gallon (mpg (US))
US customary
1 mpg (US) ≈ 0.42514371 km/L
Source: Derived from exact length, volume and time definitions (NIST SP 811 / Handbook 44)
Kilometre per litre (km/L)
metric (non-SI)
Base unit
Source: Derived from exact length, volume and time definitions (NIST SP 811 / Handbook 44)