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Conversion Tools

Fuel Economy Converter

Convert fuel economy across mpg US, mpg UK, L/100km, and km/L.

Last validated: 2026-02-14

Fuel Economy Converter translates efficiency values across mpg US, mpg UK, L/100km, and km/L so vehicle data from different regions can be compared directly. It is useful when evaluating cars, analyzing fleet consumption, or reading international specs where unit conventions differ. The tool handles reciprocal unit behavior correctly and shows all supported equivalents in one output panel. This helps avoid common manual-conversion mistakes, especially between mpg and L/100km. Use it to normalize efficiency figures before making purchasing or operational decisions.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Fuel Economy Converter

Result

30 Miles per Gallon (US) = 7.840486 Liters per 100 km (L/100km)

All Units

Miles per Gallon (US)30

Miles per Gallon (UK)36.028498

Liters per 100 km (L/100km)7.840486

Kilometers per Liter (km/L)12.754311

How to use this tool

Enter fuel economy value and choose the source unit.
Select target unit and click `Convert`.
Use the all-units table to compare efficiency across regional standards.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Value: 30.0
From unit: mpg_us
To unit: l_per_100km

Expected Outputs

Value: 30
Converted value: 7.840486

Interpretation

Value is 30.0. Use this as a decision input, not as a standalone conclusion.
Converted value is 7.840486100000001. Use this as a decision input, not as a standalone conclusion.
Cross-check the result against one alternate input set to validate sensitivity.

Scenario Compare (A vs B)

Use this to compare two input sets and quantify change in key outputs.

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