Fuel Price Change Calculator

The headline figure is the annual increase or saving from changing only the fuel price. A positive difference means the new price costs more; a negative difference means it costs less.

The old and new annual costs use the same mileage and UK MPG, so the comparison isolates the price change rather than comparing different vehicles or travel patterns.

Use the price you used to pay and the price you expect to pay, then use a realistic annual-mileage and measured UK MPG figure where possible. The result can help with a household fuel budget or show how much a regular price change matters over a year.

For a lower new price, the same calculation reports an annual saving. It does not suggest that either price will be available at a particular station.

Fuel is only one part of motoring cost. Add the fuel-price difference to your own insurance, maintenance, tax, finance and depreciation assumptions when comparing the total cost of keeping or changing a car.

A small per-mile difference can become meaningful at higher mileage. Conversely, a large pump-price change has less annual impact when the vehicle is driven less often.

Check the price against your receipts or the forecourt you expect to use; the defaults are simply editable examples. Re-run the estimate when your mileage, driving pattern or measured MPG changes.

If you are deciding whether an extra drive to a cheaper station is worthwhile, compare the pump saving with the cost of that extra journey rather than relying on this annual comparison alone.