⛽ Fuel Economy converter

Fuel Economy Converter

Convert any fuel economy unit to all others at once — km/L, L/100 km, mpg, mpg (UK).

Results

Kilometers per Liter (km/L)
15 km/L
Liters per 100 km (L/100 km)
6.66666666667 L/100 km
MPG (US) (mpg)
35.2821875 mpg
MPG (UK) (mpg (UK))
42.3721404498 mpg (UK)

📊 Fuel Economy Converter chart

Conversion line — plotted against input value.

What is the Fuel Economy Converter?

Convert any fuel economy unit to all others at once — km/L, L/100 km, mpg, mpg (UK). Fuel economy conversions let you compare cars rated in different countries. Note that L/100 km is an inverse measure — lower is better. Every conversion uses the exact internationally defined factor, so results are precise to 12 significant digits.

Fuel Economy Converter – free online fuel economy tool illustration
Fuel Economy Converter — free, exact and private.

How to use the Fuel Economy Converter

  1. Enter your value, your from unit.
  2. Results update automatically as you type; you can also press Calculate.
  3. Read the output: kilometers per liter (km/l), liters per 100 km (l/100 km), mpg (us) (mpg), mpg (uk) (mpg (uk)).
  4. Check the chart to see how the conversion scales.

Formula and method

value in target = value × (factor of source ÷ factor of target) — for offset scales the value is first converted to a reference scale

Worked example

With value = 15, from unit = Kilometers per Liter (km/L), the Fuel Economy Converter returns kilometers per liter (km/l): 15 km/L; liters per 100 km (l/100 km): 6.66666666667 L/100 km; mpg (us) (mpg): 35.2821875 mpg.

Tips for better results

  • Double-check which system a unit belongs to (for example US vs UK gallons).
  • Use the swap button to convert in the opposite direction instantly.
  • Bookmark the conversions you use most — each pair has its own page.

Frequently asked questions

What does the Fuel Economy Converter do?

Convert any fuel economy unit to all others at once — km/L, L/100 km, mpg, mpg (UK).

How is it calculated?

The Fuel Economy Converter uses this method: value in target = value × (factor of source ÷ factor of target) — for offset scales the value is first converted to a reference scale.

Can you show an example?

With value = 15, from unit = Kilometers per Liter (km/L), the Fuel Economy Converter returns kilometers per liter (km/l): 15 km/L; liters per 100 km (l/100 km): 6.66666666667 L/100 km; mpg (us) (mpg): 35.2821875 mpg.

Is the Fuel Economy Converter accurate?

Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.

Is this tool free and private?

Yes — the Fuel Economy Converter is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.

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