fuelwise Less guesswork. More clarity.

THE FUEL ECONOMY CONVERTER

MPG to litres per km.

Make sense of your fuel economy. Convert miles per gallon to
litres per kilometre and litres per 100 km, instantly.

01

Your fuel economy

Instant conversion
Gallon standard

Enter the MPG figure from your vehicle or fuel report.

Try a value

A US gallon is 3.7854 litres. For UK vehicle figures, choose UK gallons.

YOUR CONVERSIONUS MPG
0.0672L/km

litres per kilometre

Per 100 kilometres

6.72 L/100 km

Distance per litre

14.88 km/L

35 US MPG uses approximately 6.72 litres for every 100 km.

Standard unit definitionsNo sign-up neededLower L/km means less fuel used.

THE QUICK REFERENCE

Familiar numbers.
A different perspective.

Compare common MPG values at a glance.
US and UK gallons have different volumes,
so make sure you use the right column.

MPG to litres per kilometre and litres per 100 km
MPG US gallons UK gallons
L/km L/100 km L/km L/100 km
10 0.2352 23.52 0.2825 28.25
15 0.1568 15.68 0.1883 18.83
20 0.1176 11.76 0.1412 14.12
25 0.0941 9.41 0.1130 11.30
30 0.0784 7.84 0.0942 9.42
35 EXAMPLE 0.0672 6.72 0.0807 8.07
40 0.0588 5.88 0.0706 7.06
45 0.0523 5.23 0.0628 6.28
50 0.0470 4.70 0.0565 5.65
60 0.0392 3.92 0.0471 4.71
70 0.0336 3.36 0.0404 4.04
80 0.0294 2.94 0.0353 3.53

L/km rounded to 4 decimal places. L/100 km rounded to 2.

BEHIND THE NUMBERS

The formula is simple.

Divide a conversion constant by your MPG.
We keep full precision until the final result.

US MPG

Using US gallons

L/km = 2.352145833… ÷ MPG

For litres per 100 km, use 235.2145833… ÷ MPG.

AT 35 US MPG

2.352145833… ÷ 35 ≈ 0.0672 L/km
That is approximately 6.72 L/100 km.

UK / IMPERIAL MPG

Using UK gallons

L/km = 2.824809363… ÷ MPG

For litres per 100 km, use 282.4809363… ÷ MPG.

AT 35 UK MPG

2.824809363… ÷ 35 ≈ 0.0807 L/km
That is approximately 8.07 L/100 km.

How the constants are calculated: litres in one gallon ÷ kilometres in one mile. We use 1 mile = 1.609344 km, 1 US liquid gallon = 3.785411784 L, and 1 imperial gallon = 4.54609 L. See NIST unit definitions

A LITTLE MORE CLARITY

Good questions.
Clear answers.

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

L/km measures fuel used to travel one kilometre. L/100 km measures fuel used to travel 100 kilometres. Multiply L/km by 100 to get L/100 km: for example, 0.08 L/km is 8 L/100 km. Both describe fuel consumption; a lower number means less fuel used for the same distance.

How do I convert MPG to litres per kilometre?

For US MPG, divide 2.352145833… by the MPG value. For UK imperial MPG, divide 2.824809363… by the MPG value. For example, 40 US MPG is about 0.0588 L/km, while 40 UK MPG is about 0.0706 L/km.

Should I choose US or UK gallons?

Choose the gallon standard used in the original fuel economy figure. US vehicle specifications generally use US liquid gallons; UK figures generally use imperial gallons. For an imported car or an international review, check the source rather than choosing based only on where you live.

How much is 30 MPG in litres per 100 km?

30 US MPG is approximately 7.84 L/100 km, or 0.0784 L/km. 30 UK imperial MPG is approximately 9.42 L/100 km, or 0.0942 L/km. The gallon standard makes a difference.

How do I convert litres per 100 km back to MPG?

Divide 235.2145833… by your L/100 km value for US MPG, or 282.4809363… for UK MPG. For example, 8 L/100 km is approximately 29.40 US MPG or 35.31 UK MPG. To convert directly from L/km, use 2.352145833… or 2.824809363… instead.

Does a higher MPG mean better fuel economy?

Yes, when comparing the same gallon standard: higher MPG means more distance travelled per gallon. Litres per kilometre works the other way around, so lower L/km means less fuel consumed. Actual fuel use also depends on driving conditions, load and the vehicle.