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Fuel Economy Converter

Convert fuel economy between 5 units with the formula, a reverse conversion and a quick-reference table.

To convert fuel economy, enter a value and pick the units. The result appears instantly with the exact conversion formula, the reverse conversion, a quick-reference table of common values and every one of the 5 supported units. MPG and L/100km are inverses of each other, so the relationship is not linear: going from 20 to 25 mpg saves far more fuel than going from 40 to 45 mpg.

Runs in your browser
Units supported
5
Base unit
L/100km
Precision
Adjustable from 1 to 15 significant figures
Shows
Formula, reverse conversion and a common-values table
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

How accurate is this fuel economy converter?

Conversions use exact SI definitions where one exists and are computed in double-precision floating point. You can raise the displayed precision to 15 significant figures, and the unrounded result is shown separately. MPG and L/100km are inverses of each other, so the relationship is not linear: going from 20 to 25 mpg saves far more fuel than going from 40 to 45 mpg.

Can I reverse the conversion without retyping?

Yes — the swap toggle reverses the two units in place. The reverse rate is also shown in the detail section, so you can read it either way without changing anything.

Is my data sent anywhere?

No. The conversion is plain JavaScript running in your browser. No value you type is transmitted, logged or stored.

Can I link to a specific conversion?

Yes. The URL updates as you type, so you can bookmark or share a link that reopens with exactly the same conversion.

How to use the fuel economy converter

  1. 1Set the value.
  2. 2Choose the from.
  3. 3Choose the to.
  4. 4Turn "Swap direction" on or off as needed.
  5. 5Set the significant figures.
  6. 6The result appears immediately — copy or download it.

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Put the working fuel economy converter on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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