Fuel Cost Calculator
Work out what a drive actually costs in fuel — and split it with whoever's coming along. Pop in your pump price and your car's mpg. All on your device, nothing saved.
An estimate based on your figures. Real economy varies with traffic, speed, load and weather — and check today's pump price, it moves.
How to work out the fuel cost of a journey
This calculator tells you what a drive actually costs in petrol or diesel, using your own pump price and your car's fuel economy — so the figure is realistic rather than a rough guess. It works in miles per gallon (mpg) and pence per litre, converts using the UK gallon (4.546 litres), and can split the cost between passengers or double it for a round trip.
Knowing the real cost per mile makes everyday decisions easier: whether a trip is worth driving, what's fair to ask passengers to chip in, or how much a regular commute adds up to over a year. Your actual economy varies with traffic, speed, load and weather, so treat the result as a close estimate.
It all runs in your browser with nothing saved. Just check today's pump price, since it changes often.
Frequently asked questions
How do I calculate fuel cost per mile?⌄
Divide the distance by your mpg to get gallons used, multiply by 4.546 to get litres, then multiply by your price per litre. This tool does it all for you and also shows the cost per mile.
Where do I find my car's mpg?⌄
Your car's trip computer usually shows average mpg, or you can look up the official figure for your make and model. Real-world economy is often a little lower than the official number.
How can I improve my fuel economy?⌄
Drive smoothly and anticipate stops, keep tyres correctly inflated, remove unnecessary weight and roof racks, and avoid excessive idling and high speeds.
Can I use this to split fuel costs with friends?⌄
Yes. Enter how many people are sharing and it shows the cost per person — handy for road trips and car-shares.
Is anything saved?⌄
No. The calculation runs on your device and nothing is stored.