Fuel Economy Converter

Convert MPG (US and UK), km/L and L/100 km.

30 mpg (US)=7.8404861 L/100 km
1 mpg (US) = 235.21458 L/100 km 1 L/100 km = 235.21458 mpg (US)

All conversions

30
Miles per US gallon mpg (US)
36.028498
Miles per imperial gallon mpg (UK)
12.754311
Kilometers per liter km/L
7.9251616
Miles per liter mi/L
7.8404861
Liters per 100 km L/100 km

Common fuel economy conversions

mpg (US) to L/100 km
mpg (US)L/100 km
1235.21458
547.042917
1023.521458
259.4085833
504.7042917
1002.3521458
10000.23521458
L/100 km to mpg (US)
L/100 kmmpg (US)
1235.21458
547.042917
1023.521458
259.4085833
504.7042917
1002.3521458
10000.23521458
mpg (UK) to mpg (US)
mpg (UK)mpg (US)
10.83267418
54.1633709
108.3267418
2520.816855
5041.633709
10083.267418
1000832.67418
km/L to mpg (US)
km/Lmpg (US)
12.3521458
511.760729
1023.521458
2558.803646
50117.60729
100235.21458
10002,352.1458

Conversion formulas

  • US mpg to L/100 km: L/100 km = 235.215 ÷ mpg (US)
  • L/100 km to US mpg: mpg (US) = 235.215 ÷ (L/100 km)
  • UK mpg to L/100 km: L/100 km = 282.481 ÷ mpg (UK)
  • US mpg to UK mpg: multiply by 1.20095
  • km/L to L/100 km: L/100 km = 100 ÷ (km/L)

About this fuel economy converter

Fuel economy is expressed in different ways around the world: miles per gallon in the US and UK, kilometers per liter in parts of Asia and South America, and liters per 100 km in Europe, Canada and Australia. This converter handles all of them, including the inverse relationship between "distance per fuel" and "fuel per distance".

Also check the volume converter for fuel quantities and the length converter for distances.

Comparing cars

Compare a US-market car rated in mpg with a European one rated in L/100 km.

Trip budgeting

Convert to km/L or mpg to estimate how far a tank or a journey will go.

Buying imports

Check advertised consumption figures for imported vehicles, which may use a different unit or gallon size.

Tips for accurate results

Lower is better for L/100 km

With mpg and km/L a higher number means better efficiency; with L/100 km a lower number is better. That is why the two are inversely related.

US vs UK gallons

A UK (imperial) gallon is about 20% bigger than a US gallon, so 40 mpg (UK) is only about 33 mpg (US).

Frequently asked questions

How do I convert mpg to L/100 km?

Divide 235.215 by the mpg (US) value. For example, 30 mpg ≈ 7.84 L/100 km. For UK mpg, divide 282.481 by the value.

Why are UK and US mpg different?

The UK gallon is 4.546 L and the US gallon is 3.785 L, so the same car has a higher mpg figure in the UK.

What is a good L/100 km figure?

A typical modern petrol car uses roughly 6 to 8 L/100 km; efficient hybrids can be below 4.5 L/100 km.

What happens at 0?

A value of 0 mpg or km/L means infinite fuel per distance, so the L/100 km result is shown as ∞.

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