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Fuel Economy Converter – MPG, km/L & L/100km

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

Fuel Economy Converter What is this? ↓
About the Fuel Economy Converter

What is the Fuel Economy Converter?

A fuel economy converter translates between miles per gallon, kilometres per litre and litres per 100 kilometres.

Why use this calculator?

Fuel efficiency is quoted differently in the US, the UK and Europe, and the units are inversely related, which makes manual conversion confusing.

How to use it

  1. Enter the fuel economy value.
  2. Choose the source and target units.
  3. Read the result, plus a small reference table.

Formula

1 L/100km ≈ 235.214583 / (mpg US).
Higher mpg or km/L is more efficient, while higher L/100km is less efficient — the scales move in opposite directions.
Frequently Asked Questions
How many L/100km is 30 mpg?
30 mpg (US) is about 7.84 L/100km.
Why is US and UK mpg different?
Both use miles, but a US gallon (3.785 L) is smaller than an imperial gallon (4.546 L), so the same car rates higher in imperial mpg.
How precise are the conversions?
Conversions use standard, internationally defined factors and are rounded for display. They are accurate to the number of digits shown.
Can I convert back and forth without losing accuracy?
Yes. Enter the original value to get an exact inverse conversion; avoid chaining rounded results if you need maximum precision.
Which measurement system is used?
Both metric (SI) and US customary / imperial units are supported and clearly labelled.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.

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