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Unit Conversion

MPG Calculator

Convert miles per gallon to litres per 100 km, km per litre and UK MPG.

Formula and sources updated · Data sources · 1View algorithm, constants and default inputs (JSON)

Enter your values

Example

US mpg × L/100 km = 235.2145833333

Next steps

After this result, you may want to…

About this calculator

Convert between US mpg, Imperial mpg, L/100 km and km/L using the same reciprocal factors in both entries. Equal source and target units return the entered value.

Worked example

calculated with the default values below

Value 30 · From US MPG · To Litres per 100 km · Decimal places 4 · Optional journey calculation Off · Journey distance 100 km · Fuel price per litre 1.5 $ Result 7.8405 · US MPG 30.00 mpg · UK MPG 36.03 mpg · Litres per 100 km 7.84 L/100km · Kilometres per litre 12.754 km/L

Method and assumptions

Convert between US mpg, Imperial mpg, L/100 km and km/L using the same reciprocal factors in both entries. Equal source and target units return the entered value. Enable the optional journey to estimate litres from distance in kilometres and multiply by fuel price per litre. Journey cost uses the entered currency; no exchange conversion or real-world driving adjustment is applied.

Data sources

Use the cited guidance and your own measurements, bills or product specifications to choose inputs. Sample defaults are not current local data.

Disclaimer

These calculators give general conversion results. Rounding and the precision of the value you enter both affect the output, so treat displayed decimals as indicative rather than exact.

Maintained by: CalcDelta Formula and sources updated ·

Implementation source

This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.

View algorithm, constants and default inputs (JSON)

Formula and variables

L/100 km = 235.2145833333333/(US mpg) = 282.48093633182214/(UK mpg) = 100/(km/L); litres = distance_km × (L/100 km)/100

Enable the optional journey to estimate litres from distance in kilometres and multiply by fuel price per litre. Journey cost uses the entered currency; no exchange conversion or real-world driving adjustment is applied.

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Frequently asked questions

Why can I convert MPG to L/100km but not the reverse simply?

Convert between US mpg, Imperial mpg, L/100 km and km/L using the same reciprocal factors in both entries. Equal source and target units return the entered value. Enable the optional journey to estimate litres from distance in kilometres and multiply by fuel price per litre. Journey cost uses the entered currency; no exchange conversion or real-world driving adjustment is applied.