What is 30 mpg in km/L?

30 mpg (US) is about 12.75 km/L. Multiply mpg by 0.4251 for a quick estimate.

How far can I drive on 40 liters at 30 mpg?

About 510 km: 30 mpg (US) is 12.754 km/L, and 12.754 × 40 = 510.17 km. This assumes the rating holds on the whole trip.

How do a 20 mpg truck and a 50 mpg car compare in km/L?

20 mpg is about 8.50 km/L and 50 mpg is about 21.26 km/L. The car goes about 2.5 times as far per liter.

Is 30 UK mpg the same as 30 US mpg in km/L?

No. 30 mpg (US) is about 12.75 km/L, while 30 imperial mpg is about 10.62 km/L. See imperial mpg to km/L.

MPG (US) to km/L Converter

Enter a value to instantly convert between fuel economy units.

From

Precision4 dp

1 MPG (US) = 0.4251 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 × (100 / 235.214583333) (constants shown rounded)

Multiply US mpg by 0.42514 to get km/L, the factor written in the formula as 100 / 235.215. Spelled out, it is 1.609344 km per mile divided by 3.785411784 L per US gallon. Travelers renting cars abroad, importers, and anyone reading a US EPA rating against a Japanese or Indian spec sheet use this pair. A car rated 30 mpg covers about 12.75 km per liter, and 28 mpg comes to about 11.90 km/L. Both units count distance per unit of fuel, so a higher value is better on each.

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

Reviewed by the Convert Calc editorial team · Last reviewed: 2026-10-06 · see our methodology

Frequently Asked Questions

Real-World Examples

Example: US sedan at 30 mpg, restated in km/L for a trip abroad.

30 mpg = 12.754311222908163 km/L

Example: US hybrid at 50 mpg, as km/L for a European comparison.

50 mpg = 21.2571853715136 km/L

Example: US pickup at 20 mpg, shown in km/L.

20 mpg = 8.502874148605441 km/L

Example: US compact at 40 mpg, in km/L for a rental booking.

40 mpg = 17.005748297210882 km/L

mpg to l per 100km l per 100km to mpg kml to mpg

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