Car Running Cost Calculator

The true annual cost of running a car goes far beyond fuel. Fixed costs (insurance, road tax, MOT) remain the same regardless of miles driven, while variable costs (fuel, tyres, servicing) scale with usage

The calculator uses the standard published formula for car running cost. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches, kilometres, miles, litres. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: Annual fuel cost = (Annual miles / MPG) × litres per gallon × fuel price per litre. Each step in the calculation is shown so you can verify the result manually.