MPG to L/100km converter

Convert MPG to L/100km or convert back, with separate answers for US MPG, UK MPG and km/L.

Figure to convert
Starting unit

Example: 8 L/100km

Example

US miles per gallon

29.40 MPG (US)

From 8 L/100km

UK miles per gallon
35.31 MPG (UK)
Kilometres per litre
12.50 km/L
Lower L/100km and higher MPG both mean less fuel.

Example: 8 L/100km. US miles per gallon. 29.40 MPG (US). From 8 L/100km

US miles per gallon · 35.31 MPG (UK) · 12.50 km/L29.40 MPG (US)

Details

Common MPG to L/100km conversions

MPG is ambiguous unless the source says US or UK. Use the matching column: an imperial UK gallon is larger, so the same MPG number converts to a higher L/100km figure.

MPG to L/100km

Common MPG values converted to litres per 100 kilometres
Published figureIf it is US MPGIf it is UK MPG
10 MPG23.5 L/100km28.2 L/100km
12 MPG19.6 L/100km23.5 L/100km
13 MPG18.1 L/100km21.7 L/100km
14 MPG16.8 L/100km20.2 L/100km
15 MPG15.7 L/100km18.8 L/100km
16 MPG14.7 L/100km17.7 L/100km
17 MPG13.8 L/100km16.6 L/100km
18 MPG13.1 L/100km15.7 L/100km
20 MPG11.8 L/100km14.1 L/100km
23 MPG10.2 L/100km12.3 L/100km
25 MPG9.4 L/100km11.3 L/100km
30 MPG7.8 L/100km9.4 L/100km
35 MPG6.7 L/100km8.1 L/100km
40 MPG5.9 L/100km7.1 L/100km
45 MPG5.2 L/100km6.3 L/100km
50 MPG4.7 L/100km5.6 L/100km
60 MPG3.9 L/100km4.7 L/100km

L/100km to MPG

Common litres per 100 kilometres values converted to US and UK MPG
L/100kmUS MPGUK MPG
5 L/100km47.0 MPG56.5 MPG
6 L/100km39.2 MPG47.1 MPG
7 L/100km33.6 MPG40.4 MPG
8 L/100km29.4 MPG35.3 MPG
10 L/100km23.5 MPG28.2 MPG
12 L/100km19.6 MPG23.5 MPG

Convert fuel economy without mixing US and UK gallons

  1. Choose the starting unit

    Enter the number exactly as published, then select L/100km, US MPG, UK MPG or km/L before converting.

  2. Separate US MPG from UK MPG

    An imperial gallon is larger than a US gallon, so the UK MPG result is always higher for the same vehicle.

  3. Know which direction is better

    Lower L/100km means less fuel used. Higher MPG and higher km/L mean more distance from the same amount of fuel.

  4. Round only the final result

    Use the full converted value in another calculation, then round the displayed answer. Repeated early rounding creates avoidable drift.

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Efficiency converter questions

What is 13 MPG in L/100km?

13 US MPG is 18.09 L/100km. 13 UK MPG is 21.73 L/100km. Check whether the original figure uses a US or imperial UK gallon before choosing the result.

What is L/100km?

Litres of fuel used to drive 100 kilometres, the standard measure in Australia, New Zealand and the EU. Lower numbers mean better economy.

How do US and UK MPG differ?

A US gallon is 3.785 litres while an imperial (UK) gallon is 4.546 litres, so UK MPG figures are always higher than US MPG for the same car. For both, higher is better.

What is km/L?

Kilometres travelled per litre of fuel, a measure common across Asia. Higher numbers mean better economy.