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MPG to KMPL Converter

Convert fuel economy between US mpg, imperial mpg, km/l, miles per litre and litres per 100 km using exact unit definitions.

About this tool

MPG to KMPL Converter

Convert fuel economy between US mpg, imperial mpg, km/l, miles per litre and litres per 100 km using exact unit definitions.

The MPG to KMPL Converter translates fuel economy between US mpg, imperial mpg, km/l, miles per litre and litres per 100 km using exact unit definitions — 1 mile = 1.609344 km, 1 US gallon = 3.785411784 litres, 1 imperial gallon = 4.54609 litres. It handles the fact that km/l and mpg are distance-per-fuel (higher is better) while l/100 km is fuel-per-distance (lower is better), so the two families are reciprocals. Useful when a review quotes mpg, a brochure quotes km/l and a European spec sheet quotes l/100 km.

How to use MPG to KMPL Converter

  1. 1

    Open MPG to KMPL Converter on AltFTool — it loads instantly in your browser.

  2. 2

    Type the number in 'Fuel economy figure' and pick its unit in 'Unit of that figure' — US mpg, imperial mpg, km/l, miles per litre or litres per 100 km.

  3. 3

    Set 'Fuel price per litre (for cost figures)' to price the economy at your own pump rate.

  4. 4

    Read the km/l headline plus every equivalent — US and UK mpg, mi/l, l/100 km, cost per km and per 100 km — and press 'Copy result'.

Why use MPG to KMPL Converter

  • Exact definitions

    Uses the legal gallon and mile values, not rounded shortcuts.

  • Both gallons handled

    Keeps US and imperial mpg separate so you never compare the wrong one.

  • Cost attached

    Adds fuel cost per km and per 100 km at your pump price.

Common use cases

  • Reading a US car review that quotes 32 mpg and wanting the km/l equivalent
  • Comparing an Indian brochure figure in km/l against a European l/100 km rating
  • Converting a UK magazine's mpg figure without mistaking it for the US number

Frequently asked questions

How do I convert mpg to kmpl?

Multiply US mpg by 0.425144 to get km/l, or divide by 2.352146. So 30 US mpg is 12.75 km/l. For imperial mpg the multiplier is 0.354006, because a UK gallon holds 4.54609 litres against the US gallon's 3.785412.

Is US mpg the same as UK mpg?

No. An imperial gallon is about 20.1% larger than a US gallon, so the same car scores about 20% higher in UK mpg. 30 US mpg is 36.0 UK mpg — quoting one for the other overstates or understates efficiency by a fifth.

How do I convert km/l to litres per 100 km?

Divide 100 by the km/l figure, since the two units are reciprocals. 20 km/l is 100 ÷ 20 = 5.0 l/100 km, and 12.75 km/l is 7.84 l/100 km.

Which unit is best for comparing running cost?

Litres per 100 km scales linearly with fuel spend, so a 1 l/100 km improvement is worth the same money whether the car is thirsty or frugal. With mpg or km/l the same numerical gain matters far more at the low end — going from 10 to 12 km/l saves much more fuel than going from 20 to 22.

Embed this tool on your site

Add the MPG to KMPL Converter widget to your blog or website — free, responsive, no signup. Just keep the “Widget by AltFTool” credit link visible.

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