Fuel Economy Converter
Fuel Economy conversion workspace
Enter a decimal, fraction or quick calculation — for example 12.5, 3/8 or (12*4)+6.5.
Batch conversionconvert up to 100 values at once
No values yet.
Compare all fuel economy units
One input, every supported equivalent. Select any row as the main target.
| Unit | Equivalent | Target action |
|---|---|---|
| Liters per 100 km L/100 km | 7 | SourceSource |
| Miles per Gallon (US) mpg | 33.6 | TargetSelected |
| Miles per Imperial Gallon (UK) mpg (UK) | 40.35 |
Fuel economy can be expressed as volume used per distance or distance per volume.
Sourced factorsFormula
L/100 km × US mpg = 235.214583; L/100 km × UK mpg = 282.480936
Calculations use the central unit catalog and preserve precision until the result is formatted.
Common conversions
| Input | From | To | Result |
|---|---|---|---|
| 7 | Liters per 100 km | Miles per Gallon (US) | 33.6020833333 |
Common fuel economy conversions
Curated references with worked examples, formulas and the full interactive converter.
Frequently asked questions
Why does fuel-economy conversion use division instead of multiplication?
L/100 km measures fuel used, while mpg measures distance traveled per fuel volume. They move in opposite directions. US and Imperial mpg are labelled separately because their gallons differ.
Are the results rounded?
The calculation retains full JavaScript number precision; the precision control only formats the displayed result.
Accuracy & transparency
Sources & methodology
Calculations keep full numeric precision until display formatting. These references describe the definitions, variants or factors used; links do not imply affiliation.
SI definitions and published coefficients for selected non-SI units.
Reference factors and named variants for commonly used units, including US liquid cooking measures and British stone.
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