Convert

Miles per imperial gallon to Litres per 100 kilometres

Exact answer: l/100 km = 282.480936 / (mpg imp) (inverse relationship, not a linear factor)

Miles per imperial gallon and Litres per 100 kilometres run in opposite directions. A higher value in one unit means a lower one in the other. Consumption figures appear in vehicle data, test reports and travel cost calculations.

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What do you want to convert?

From10 mpg imp

Result28.248094 l/100 km

FactorInverse formula

Source basisNIST Guide to SI Appendix B

Examples

0110 mpg imp = 28.248094 l/100 km

Example value from the reference table. Internal calculation uses stored factors; display output is rounded.

02Common mistake

mpg and l/100 km move in opposite directions. Higher mpg means lower consumption; higher l/100 km means higher consumption.

03Base unit: l/100 km

Fuel units are normalised through litres per 100 kilometres; mpg and km/l are inverse values.

Table

Miles per imperial gallon to Litres per 100 kilometres
Miles per imperial gallon	Litres per 100 kilometres
10	28.248094
20	14.124047
30	9.416031
40	7.062023
50	5.649619
80	3.531012

Formula

Fuel units are normalised through litres per 100 kilometres; mpg and km/l are inverse values.

Sources

NIST Guide to SI Appendix BNIST conversion-factor method and non-SI factors.

Related conversions

Miles per US gallon to Litres per 100 kilometresmpg US → l/100 kmFuel economy Litres per 100 kilometres to Miles per US gallonl/100 km → mpg USFuel economy Kilometres per litre to Litres per 100 kilometreskm/l → l/100 kmFuel economy Litres per 100 kilometres to Kilometres per litrel/100 km → km/lFuel economy

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Factor origin

Factors come from the stored source family and are not derived from rounded display values.

Rounding rule

UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.

When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, conversion with formula, sources reviewed: September 2026. Fuel economy. Source basis: NIST Guide to SI Appendix B.

Common questions

Which formula applies to Miles per imperial gallon to Litres per 100 kilometres?

l/100 km = 282.480936 / (mpg imp)

Which formula does Miles per imperial gallon to Litres per 100 kilometres use?

Fuel units are normalised through litres per 100 kilometres; mpg and km/l are inverse values.

What is the most common mistake?

mpg and l/100 km move in opposite directions. Higher mpg means lower consumption; higher l/100 km means higher consumption.

When should I verify the result?

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.