Why the fuel cost per mile calculator matters
Reimbursement rates bundle fuel with depreciation and maintenance, so knowing the fuel-only number tells you which part of the rate you actually keep. This page turns that decision into a handful of inputs you can defend in a budget review: volume, unit cost, rate of adoption, and time. The output is a planning baseline, not a promise — it tells you whether the idea deserves a vendor quote, a pilot, or a pass.
- • Biggest swing factor: fuel economy
- • Second-order factor: pump price
- • Often ignored: how much of your driving is highway versus city
What actually changes the answer
fuel economy moves this number first, then pump price. Run a conservative case and an upside case before you commit. If the maths only works in the upside case, treat it as a time-boxed test with a kill date rather than a line in next year's plan.
What to do with the result
Compare fuel-only cost per mile against your reimbursement rate. The difference is what covers wear — and it should.
FAQ
What does the fuel cost per mile calculator work out?
It applies Cost per trip = (distance ÷ MPG) × price per gallon; Monthly = cost per trip × trips to the values you enter for miles per journey, fuel economy (mpg), fuel price per gallon, journeys per month. Reimbursement rates bundle fuel with depreciation and maintenance, so knowing the fuel-only number tells you which part of the rate you actually keep.
How accurate is this fuel cost per mile calculator?
Fuel only, by design. Add 20–35 cents per mile for total running cost including depreciation. Replace the defaults with your own invoice, usage export, payroll data, statement, or vendor quote before making a commitment — the maths is exact, so the answer is only as good as the inputs you feed it.
Which input should I stress-test first?
fuel economy. Re-run with a pessimistic value for it; if the decision flips, that assumption is the thing you need real data on before signing anything. After that, check pump price and how much of your driving is highway versus city.
Which scenario should I start from?
Start with the preset closest to your situation — cheap fuel, efficient run, typical case, expensive fuel, heavy load — then edit the sliders. Presets are realistic starting points, not benchmarks to match, and every change updates the result instantly.
What should I do after running the numbers?
Compare fuel-only cost per mile against your reimbursement rate. The difference is what covers wear — and it should. A useful planning benchmark to compare against: Fuel alone typically runs 11–18 cents per mile in a passenger car.
Can I share or save this calculation?
Yes. Your inputs are written into the page URL, so copying the link shares the exact scenario you are looking at — the person who opens it sees the same numbers. You can also export the inputs and results to CSV or PDF from the result card and keep it with the rest of your workings.
How this calculator is built
Independently maintained
Written by Sam Doshi and the RevenueLab editorial team. We don't sell the data feeds this tool is built on.
Sourced from primary data
Benchmarks come from public AdSense / Stripe / IRS disclosures and reader-submitted data — never third-party "$X per view" claims. Full methodology.
Last editorial review
Reviewed on a rolling quarterly cycle. Dated reviews are published on the methodology record for each calculator.
Editorial standards
See our editorial policy and disclaimer. Results are estimates, not advice.