Cost per Kilometre Calculator
True cost to drive each kilometre.
Calculate the real cost per kilometre of driving, including fuel, maintenance, insurance, and depreciation. Enter fuel cost and see the result instantly.
What this tool does
Enter annual running costs and annual distance. The tool calculates cost per kilometre driven.
Enter Values
Formula Used
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Calculations, display, or translation — let us know.
Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Per-kilometre driving cost includes more than fuel. Maintenance, insurance, road tax, and depreciation often add up to twice the fuel cost. A car costing 2,000 in fuel plus 2,500 in everything else, driven 15,000 km a year, costs 30p per km — not 13p. This is the number to use when comparing driving to train, rideshare, or declining a long commute.
Quick example
With annual fuel cost of 2,000 and annual maintenance of 800 (plus annual insurance + tax of 900 and annual depreciation of 800), the result is 0.30. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.
Which inputs matter most
You enter Annual Fuel Cost, Annual Maintenance, Annual Insurance + Tax, Annual Depreciation, and Annual Distance. Frequency and unit price pull the total in different directions. The biggest surprise for most people is how small recurring amounts compound into large annual figures — that's where this calculation earns its keep.
What's happening under the hood
Total annual cost divided by annual distance. Includes fuel, maintenance, insurance, tax, and depreciation for a full running cost. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.
Using the result to negotiate
The figure gives you a concrete number to quote when shopping alternatives. "I'm paying £X annually" cuts through marketing in a way "I want a better deal" doesn't. The specificity wins.
What this doesn't capture
Usage varies month-to-month; tariffs change; discounts come and go. The figure here is a clean baseline — your actual annual bill will fluctuate around it. Use the calculation to benchmark providers, not as a prediction of a specific bill.
Cost per kilometre produces a per-km figure based on the inputs provided.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
Total annual cost divided by annual distance. Includes fuel, maintenance, insurance, tax, and depreciation for a full running cost.
References
Frequently Asked Questions
Do I need to include depreciation?
How do I estimate depreciation?
What about electric?
Is this the right number for trips?
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