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MPG (Imperial) to km/L Converter

Enter a value to instantly convert between fuel economy units.

Precision4 dp

1 MPG (Imperial) = 0.354 Km per Liter

Key Formulas

MPG (US) → Liters per 100km

L/100km ≈ 235.215 / mpg

Liters per 100km → MPG (US)

mpg ≈ 235.215 / L/100km

Km per Liter → MPG (US)

mpg = km/L × 2.35215

MPG (US) → Km per Liter

km/L = mpg × 0.425144

Formula

km/L = mpg imp × (100 / 282.480936332) (constants shown rounded)

Multiply imperial mpg by 0.35401 to get km/L, the factor written in the formula as 100 / 282.481. The constant 282.481 is 100 times 4.54609 L per imperial gallon, divided by 1.609344 km per mile. UK brochures, reviews, and used-car listings quote imperial mpg, while Japanese and Indian sources use km/L. A car rated 40 mpg imperial runs about 14.16 km/L. Treating an imperial figure as US mpg overstates the efficiency by about 20%, since the imperial gallon is about 20% larger than the US gallon.

Source: NIST named gallon and mile definitions; reciprocal fuel ratio derived from them

Reviewed by the Convert Calc editorial team · Last reviewed: · see our methodology

Frequently Asked Questions

Real-World Examples

Example: UK hatchback at 40 mpg, restated in km/L.

40 mpg imp = 14.160247597385887 km/L

Example: UK economy car at 55 mpg, as km/L for a European comparison.

55 mpg imp = 19.470340446405594 km/L

Example: UK estate car at 30 mpg, shown in km/L.

30 mpg imp = 10.620185698039416 km/L

Example: UK hybrid at 60 mpg, converted to km/L.

60 mpg imp = 21.24037139607883 km/L

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