My American car gets 35 mpg EPA combined. A Japanese car I'm considering is rated 14.5 km/L. Which is more efficient?

35 mpg ÷ 2.352 = 14.9 km/L. Your current car is very slightly more efficient. However, Japanese test cycles (JC08 or WLTC) and US EPA tests produce different results from real-world driving, so the gap may close or reverse in practice.

I'm setting up a spreadsheet to compare global fleet vehicles. My US cars are in mpg and my Asian fleet is in km/L. What formula should I use?

To convert a cell from mpg (US) to km/L: =A1/2.35214583. To go the other way (km/L to mpg US): =A1*2.35214583. These factors are exact to 8 significant figures.

Is the relationship linear? If I double my car's mpg, do I double the km/L?

Yes — both km/L and mpg are 'distance per volume', so they scale linearly. Double the mpg and you get exactly double the km/L. This is unlike comparing mpg to L/100km, where the inverse relationship means doubling mpg halves L/100km.

My electric car's efficiency is quoted in MPGe. Can I convert MPGe to km/L?

You can apply the same formula mathematically (divide MPGe by 2.352), but the result isn't directly comparable to petrol km/L. MPGe uses a fixed energy equivalent (33.7 kWh = 1 US gallon of petrol) and doesn't reflect actual fuel use. For EVs, the more useful metric is kWh/100km.

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 = mpg × 235.215

Liters per 100km → MPG (US)

mpg = L/100km × 235.215

Km per Liter → MPG (US)

mpg = km/L × 2.35215

MPG (US) → Km per Liter

km/L = mpg × 0.425144

Formula

km/L = mpg (US) ÷ 2.35214583

American EPA stickers rate fuel economy in miles per US gallon, while Japan, South Korea, India, and much of Asia use kilometres per litre. Both are 'distance per volume' metrics — higher is better in both cases — so unlike comparing mpg to L/100km, there's no inversion. You simply divide the mpg (US) figure by 2.352 to get km/L. This is useful when cross-shopping a Japanese import, evaluating a fleet vehicle from an Asian manufacturer, or understanding how a car's specs translate between markets.

Source: US EPA Fuel Economy Methodology

Last reviewed: 2026-06-11 · see our methodology

Frequently Asked Questions

Real-World Examples

Toyota Camry combined EPA rating of 30 mpg equals 12.8 km/L — a figure that would be considered average in the Japanese domestic market.

30 mpg = 12.76 km/L

Toyota Prius combined EPA rating of 50 mpg converts to 21.3 km/L, matching Toyota's own Japanese market JC08 ratings for the hybrid.

50 mpg = 21.26 km/L

Ford F-150 combined rating of 20 mpg equals 8.5 km/L — below average by Asian market standards, where trucks of this size are uncommon.

20 mpg = 8.51 km/L

Honda Civic hybrid at 40 mpg converts to 17 km/L — competitive with top-tier compact hybrids sold in Japan and Korea.

40 mpg = 17.01 km/L

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

MPG (US) to km/L Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

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