Use this calculator to work out MPG (UK) from miles travelled and fuel used in litres or imperial gallons.
Inputs
This topic also has a deeper guide and a printable reference pack, so you can move from the live answer into the method, assumptions, and worked examples without leaving the topic cluster.
These are the main values the calculator uses. Keep the units consistent and, where relevant, match the assumptions explained in the related guide.
Unit: mi
Enter the trip distance in miles for the same fuel-use interval.
Unit: L
Use the litres of fuel consumed before converting to MPG (UK).
Use this page when you want a UK-format fuel-efficiency figure from the distance and fuel values you already have.
The main result is miles per imperial gallon. It is best used for comparing repeat trips or vehicles with the same gallon convention kept throughout.
If a vehicle covers more miles from the same amount of fuel, the MPG (UK) figure rises. That is the distance-first view of the same efficiency story described by fuel-consumption tools.
This page uses UK imperial gallons deliberately. Results should not be compared directly with US MPG figures unless the gallon basis is converted first.
Because the imperial gallon used in UK motoring is larger than the US gallon. The label keeps the unit basis explicit so comparisons stay honest.
Calculate fuel efficiency from the distance and fuel figures you enter yourself, with no hardcoded prices or regional assumptions.
Use the Gallons (UK) to Litres Calculator for everyday conversions, travel planning, or kitchen maths with clear units where relevant.
Use the Litres to Gallons (UK) Calculator for everyday conversions, travel planning, or kitchen maths with clear units where relevant.
Use the Miles to Kilometres Calculator for everyday conversions, travel planning, or kitchen maths with clear units where relevant.