Automotive · Free tool
Gas Mileage Calculator
MPG from miles + gallons, plus cost per mile and monthly fuel cost. Comparison table across 7 MPG tiers.
Updated April 2026
MPG
27.2
Cost per mile
$0.13
Monthly fuel cost
$152
Annual fuel cost by MPG — at $3.45/gal & 14,000 mi/yr
| MPG | Cost per mile | Cost per year |
|---|---|---|
| 15 MPG | $0.23 | $3,220 |
| 20 MPG | $0.17 | $2,415 |
| 25 MPG ← yours | $0.14 | $1,932 |
| 30 MPG | $0.12 | $1,610 |
| 35 MPG | $0.10 | $1,380 |
| 40 MPG | $0.09 | $1,208 |
| 50 MPG | $0.07 | $966 |
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What it does
Real MPG from your last tank, translated into cost per mile and annual fuel spend. See how much better (or worse) MPG changes the yearly bill.
Runs entirely in your browser — no upload, no account, no watermark. For more tools in this category see the full tools index.
Embed this tool on your siteShow snippetHide
Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.
<iframe src="https://freetoolarena.com/embed/gas-mileage-calculator" width="100%" height="720" frameborder="0" loading="lazy" title="Gas Mileage Calculator" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>How to use it
- Enter miles driven and gallons used.
- Enter gas price.
- Read MPG and annual cost.
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