Car Cost Per Mile Calculator
Work out the true cost per mile of running your car, including depreciation.
Your result
Updates as you type. Based on 2025/26 UK figures where relevant.
How this is worked out
Add up every yearly cost of owning the car, then divide by the miles you drive.
Tips
- UK MPG uses imperial gallons (4.546 litres), which differ from US gallons.
- HMRC's approved mileage rate is 45p per mile for the first 10,000 business miles.
- Home EV charging on an off-peak tariff is usually far cheaper than public rapid chargers.
Guides for this calculator
- How to Calculate Car Running Cost Per Mile in the UK: Step-by-Step Guide
- Car Running Cost Per Mile: Common Mistakes, Tips and FAQs
More motoring calculators
Frequently asked questions
How does the car Cost Per Mile Calculator work?
Add up every yearly cost of owning the car, then divide by the miles you drive.
What MPG should I use?
Use your real-world figure from your car's trip computer if you can; official figures are often optimistic.
Can I claim for commuting miles?
No. Normal commuting to a permanent workplace doesn't count as business mileage.
How often do HMRC mileage rates change?
Rarely. The 45p rate has been unchanged for many years, but always check GOV.UK.
This calculator gives an estimate for general information. It isn't financial, tax, legal or medical advice. Check official figures on GOV.UK or NHS.uk, or speak to a qualified adviser.