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Convert Fuel consumption

Here you can convert units like Liters per kilometer, Liters per 10 kilometers, Liters per 100 kilometers, Kilometers per liter, etc. within the fuel consumption category.

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Unit Value Actions
Liters per kilometer L/km
Liters per 10 kilometers L/10 km Liters consumed per 10 km. Read more
Liters per 100 kilometers L/100 km European standard for fuel economy. Read more
Kilometers per liter km/L
Unit Value Actions
Miles per gallon (US) mpg (US) US standard fuel economy (using US Gallons). Read more
Gallons per 100 miles (US) gal/100 mi (US)
Unit Value Actions
Miles per gallon (UK) mpg (UK) UK standard fuel economy (using Imperial Gallons). Read more
Gallons per 100 miles (UK) gal/100 mi (UK)

Common mistakes in fuel consumption conversion

  • Between the Scandinavian liters-per-mil and liters per 100 km lies a factor of 10: 0.8 l/mil is 8 l/100 km. Swedish car ads often quote l/mil while EU specs use l/100 km. Move the decimal point one step, not two.
  • Km/l and l/100 km are inverses of each other: the conversion is 100 divided by the value, in both directions. 5 l/100 km equals 20 km/l. Note that lower is better in l/100 km but higher is better in km/l, never compare the raw numbers directly.
  • US and UK mpg use different gallons: the imperial gallon (4.546 L) is 20% larger than the US gallon (3.785 L). The same car therefore scores about 20% higher in UK figures, 40 mpg UK ≈ 33 mpg US. Check which gallon a source means.
  • Mpg is inverted relative to consumption, so improvements are not linear: going from 10 to 20 mpg halves fuel use, while 40 to 50 mpg cuts it by only a fifth. Convert to l/100 km when comparing savings, that scale is proportional to actual fuel burned.

Quick conversion quiz

Score: 0

0.2 kilometers per liter equals 500 liters per 100 kilometers.

Correct answer: 0.2 kilometers per liter = 500 liters per 100 kilometers.

18.2 kilometers per liter equals 47.1 miles per gallon (US).

Correct answer: 18.2 kilometers per liter = 42.8 miles per gallon (US).

19.3 miles per gallon (US) equals 12.2 liters per 100 kilometers.

Correct answer: 19.3 miles per gallon (US) = 12.2 liters per 100 kilometers.

3 kilometers per liter equals 6 miles per gallon (US).

Correct answer: 3 kilometers per liter = 7.06 miles per gallon (US).

Definitions

Liters per 10 kilometers (L/10 km)

Liters consumed per 10 km.

Liters per 10 kilometers is a fuel consumption unit used primarily in Sweden and Norway, usually by writing 'liter per mil', where 'mil' refers to the equivalent of 10 kilometers.

Liters per 100 kilometers (L/100 km)

European standard for fuel economy.

Liters per 100 kilometers (L/100km) is the standard method for measuring fuel consumption in most of Europe, Canada, and Australia. A lower number indicates better fuel economy.

Miles per gallon (US) (mpg (US))

US standard fuel economy (using US Gallons).

Miles per gallon (MPG) is the standard unit for fuel economy in the United States. It measures how far a vehicle can travel on one US gallon of fuel. A higher number indicates better efficiency. Note that the US gallon is smaller than the UK gallon.

Miles per gallon (UK) (mpg (UK))

UK standard fuel economy (using Imperial Gallons).

Miles per gallon (MPG) is also used in the UK, but it is based on the Imperial gallon, which is about 20% larger than the US gallon. Therefore, MPG values in the UK appear higher than in the US for the same efficiency.

Frequently asked questions

What is the difference between L/100 km and km/L?

L/100 km is liters used per 100 km (lower is better). km/L is distance per liter (higher is better). You can convert with: km/L = 100 ÷ (L/100 km).

How do I convert L/100 km to US mpg?

Use: US mpg = 235.215 ÷ (L/100 km). Example: 7.0 L/100 km ≈ 33.6 mpg (US).

How do I convert L/100 km to UK mpg?

Use: UK mpg = 282.481 ÷ (L/100 km). Example: 7.0 L/100 km ≈ 40.4 mpg (UK).

Why is UK mpg different from US mpg?

The gallon sizes differ. A UK (imperial) gallon is about 4.546 L, while a US gallon is about 3.785 L, so UK mpg numbers are higher.

How do I calculate fuel cost for a trip?

Liters needed = (distance_km ÷ 100) × (L/100 km). Then cost = liters × price per liter.

Why does my fuel economy look “wrong” after converting?

Because some units invert the meaning (L/100 km vs mpg). Lower L/100 km is better, but higher mpg is better, so the number changes direction.

How do I use the fuel consumption converter on konvertera.nu?

Enter your value (like 6.5 L/100 km), choose the unit you want (like mpg US), and konvertera.nu converts it instantly.

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