Free calculators
Fuel calculators
Twelve quick tools for the sums every driver does in their head, prefilled with today's typical UK prices from the official data and updated 28 August 2026. Three of them read the live prices near your postcode, so the answer is for your forecourts, not a national average.
Free calculatorFuel cost calculatorEnter the distance, your car's mpg and the price per litre, and see what the journey costs in fuel. Prefilled with today's typical UK price.Open the calculatorFree calculatorTrip cost calculatorWork out the fuel for a longer trip and split it fairly between the people in the car.Open the calculatorFree calculatorMPG calculatorFill the tank, note the miles until the next fill, and this works out the mpg your car actually returns, plus your cost per mile.Open the calculatorFree calculatorEV vs petrol running cost calculatorCompare what a year of driving costs in fuel for a petrol car against electricity for an electric car, with your own mileage and tariff.Open the calculatorFree calculatorHow much does it cost to fill my tank?Enter your tank size and postcode district, and see what a full tank costs at the cheapest forecourt near you today versus the dearest, and how much the difference is worth.Open the calculatorFree calculatorCommute cost calculatorYour round trip, your days a week and your mpg, against the live price near you, giving the weekly, monthly and yearly cost of driving to work and the saving from the cheapest forecourt.Open the calculatorFree calculatorThe motorway services penaltyMotorway services charge far more per litre than the forecourts a few miles off the junction. See what that costs you on one tank and across a year.Open the calculatorFree calculatorMileage allowance calculatorWork out what you can claim for business miles in your own car using HMRC's approved mileage rates, with the 10,000 mile step built in.Open the calculatorFree calculatorPetrol or diesel: which should you buy?Diesel usually goes further on a litre but costs more per litre. Enter your yearly mileage and the two cars' mpg to see which is cheaper to fuel, and by how much.Open the calculatorFree calculatorHow far can I drive on a budget?Enter the money you want to spend, the price per litre and your mpg, and see how many litres you get and how far they take you.Open the calculatorFree calculatorWhat is in a litre of fuel?Type in a pump price and see how much of it is fuel duty, how much is VAT, and how much is left for the fuel itself and the retailer.Open the calculatorFree calculatorWhat does a fuel loyalty scheme really save?Points and pence off schemes sound generous. Enter your yearly fuel use and see what a scheme actually puts back in your pocket, and how it compares with simply buying at a cheaper forecourt.Open the calculator
All of these are free, need no account and run in your browser, so nothing you type is sent anywhere. Figures are a guide, since your car, your driving and your local prices will vary. For the exact price at every forecourt near you, use the price finder.