What does your drive really cost?
Estimate only. Gas cost = (miles ÷ MPG) × price per gallon. Deduction uses the current IRS business rate (76¢/mi); it lowers taxable income and isn't tax advice.
This is the math. The app is the movie.
A calculator gives you an estimate. LiveGasCost gives you the real number — the actual dollars leaving your tank climbing live, mile by mile, while you drive. And it logs every business mile for your taxes automatically.
Join the waitlistHow your gas cost is calculated
It's simpler than it feels. Take the distance you drive, divide by your car's miles-per-gallon to get the gallons you burn, then multiply by what you pay at the pump. A 30-mile round-trip commute in a 25-MPG car at $3.89 a gallon burns about 1.2 gallons — roughly $4.67 a day, which is where a “cheap” commute quietly turns into $1,200+ a year. Seeing the yearly number is usually the wake-up call.
Why it's worth watching live
A once-a-year total is easy to ignore. Watching the cost tick up in real time as you drive changes how it feels — the same way a live fare meter makes you notice a long detour. If any of those miles are for work, they're also a tax deduction, so the drive is costing you gas and earning you a write-off at the same time. LiveGasCost shows both, live.
Working out a deduction rather than a fuel bill? Use the mileage deduction calculator, or read the IRS mileage rate guide.
Is this gas cost calculator free?
Yes, completely. Use it as much as you like. If you want the live version that runs while you actually drive — and logs your business miles for taxes — that's the LiveGasCost app.
What gas price should I enter?
Use what you actually pay locally. The national average for regular was about $3.89 a gallon in mid-2026, so that's the default — but prices vary a lot by region and station.
How do I turn my miles into a tax deduction?
Check "these are business miles." We multiply your yearly business miles by the current IRS standard rate (76¢ per mile as of July 1, 2026). To actually claim it you need a mileage log — which is exactly what the LiveGasCost app keeps for you automatically.
Does the IRS rate really change mid-year?
It can. In 2026 the IRS raised the business rate from 72.5¢ to 76¢ effective July 1, 2026 because gas prices jumped about 38%. The LiveGasCost app applies the correct rate to each trip's date, so a split year stays accurate.