Easily calculate your vehicle's fuel efficiency, track your costs, and save money on every journey.
An MPG calculator is a fuel-efficiency tool that works out how many miles your car travels per gallon of fuel. Enter distance and fuel used, and it returns your real-world MPG so you can measure performance, compare journeys, and spot changes in running costs over time.
UK drivers often see different figures online because UK gallons (4.546 litres) are larger than US gallons (3.785 litres). For the same trip, UK MPG looks higher. Use this calculator to keep units consistent, compare like-for-like results, and link MPG directly to UK fuel prices.
Calculating MPG (miles per gallon) is a simple process that involves a few steps. Here's how to do it:
Begin by filling up your vehicle's fuel tank completely until the pump clicks off.
Reset your vehicle's trip odometer to zero to track the miles for this specific calculation.
Drive as you normally would until you need fuel again. Try to use your regular routes.
Fill up your tank again. Note the miles driven on your trip odometer and the exact amount of fuel added.