Convert MPG (UK) to Kilometers per Liter
MPG (UK) to kilometers per liter is the conversion you need when a car's economy is quoted in imperial miles per gallon but you measure distance in kilometers and fuel in liters. One MPG (UK) is about 0.354006190 km/L, so the number gets smaller when you switch from imperial MPG to km/L.
Miles per gallon (UK) to Kilometers per liter conversion table
| Miles per gallon (UK) (mpg (UK)) | Kilometers per liter (km/L) |
|---|---|
| 1 | 0.354006 |
| 2 | 0.708012 |
| 3 | 1.062019 |
| 5 | 1.770031 |
| 10 | 3.540062 |
| 20 | 7.080124 |
| 50 | 17.700309 |
| 100 | 35.400619 |
| 500 | 177.003095 |
| 1,000 | 354.00619 |
The formula
To convert MPG (UK) to kilometers per liter, multiply the imperial figure by 0.354006190:
km/L = MPG (UK) × 0.354006190
A worked example
Say a car is rated at 40 MPG (UK) and you want km/L:
40 × 0.354006190 = 14.16 km/L
So 40 MPG (UK) is about 14.16 km/L.
Why it's an approximation
This conversion swaps two units at once: miles become kilometers, and imperial gallons become liters. Both measure the same idea — distance per unit of fuel — so they point the same way, and a higher MPG (UK) always gives a higher km/L. But neither the mile-to-kilometer step nor the gallon-to-liter step lands on a clean number, so the combined factor 0.354006190 is rounded. That's why the result is approximate rather than exact.
When you'll use it
Reading a UK car rating in the metric measure many drivers use, comparing an imperial MPG figure against a spec quoted in km/L, or picturing an imported car's fuel economy in kilometers and liters.
Frequently asked questions
How many km/L is 40 MPG (UK)?
About 14.16 km/L. Multiply 40 by 0.354006190 to get 14.16 — a smaller number, because miles and gallons are both larger units than kilometers and liters.
Does higher MPG (UK) mean higher km/L?
Yes. Both measure distance per unit of fuel, so they move the same way — a car with more MPG (UK) also has more km/L. Only the units change, not the direction.
Is the MPG (UK) to km/L conversion exact?
No. The factor 0.354006190 is rounded, because the mile-to-kilometer and gallon-to-liter conversions don't combine into a clean ratio. It's close enough for real use, but it stays an approximation.