Fuel Cost Calculator
Work out exactly what any journey will cost in fuel. Compare petrol vs diesel vs electric, or find out your true annual fuel bill based on mileage.
Calculating Journey Fuel Costs
Converting MPG to L/100km
Divide 282.5 by your MPG figure. A car achieving 40 MPG = 282.5 ÷ 40 = 7.06 L/100km. Most fuel economy figures are given at motorway speeds — expect 10–20% higher consumption in urban driving.
Annual Fuel Cost
To find your annual fuel cost, enter your total annual mileage as the distance. This is one of the highest-value calculations for deciding between car models — the difference in fuel costs over 5 years between a 40 MPG and 60 MPG car can exceed the purchase price difference.
Electric Vehicle Equivalent
Electric cars use kWh per 100km instead of litres. A typical EV uses 15–20 kWh/100km. At £0.28/kWh, that's £4.20–5.60 per 100km — versus £10.50 for a petrol car at 7 L/100km.
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