Thirty miles a day doesn’t feel like a number: it’s “half an hour or so” and some gas. The format is the trick — commuting is billed in daily installments, and no single installment is big enough to make you run the full total. Most American workers drive to work alone (68.7% in the Census Bureau’s 2022 commuting brief), each carrying a bill they’ve never itemized. This calculator itemizes it.
How it works
Two parts. The cash: miles × days × your car’s cost per mile — not just gas, but wear, insurance, depreciation; the IRS’s all-in 2026 estimate is 72.5 cents. And the time: your daily minutes on the road, priced at what an hour of yours is worth.
yearly cost = miles × days × $/mile + hours on the road × hourly value
The third line is the perspective-changer: the cash alone, contributed every year and compounded at the return you pick, over the horizon you pick.
A worked example
30 miles round trip, 5 days a week, 48 weeks: 7,200 miles a year. At $0.725/mile that’s $5,220 in cash. Add 55 minutes a day in the car — 220 hours a year, over nine full days — priced at $20/h: another $4,400. Total: $9,620 a year, about $802 a month.
And the last line: the $5,220 of car money alone, invested yearly at 5% for ten years, becomes $65,656. Mr. Money Mustache built one of the most-read personal-finance posts ever on exactly this arithmetic — the home-to-work distance is one of the few expenses you decide once and then pay for years, every day, twice a day.
The number that decides everything
It isn’t the cost per mile, which moves little: it’s the distance. Halve the miles above and watch the two big lines. That’s why this math belongs in the week you choose an apartment or weigh a job offer — not after. A pricier rent near work can cost less than a bargain mortgage 25 miles out, once the commute enters at full price. And a higher salary across town can be worth less, net of the drive, than the one nearby.
The honest limits
- The hourly value is yours, not the market’s. Nobody pays you for time in traffic: pricing it is for comparing alternatives, not for cashing it. The note under the calculator says it plainly — the pot compounds cash only.
- Remote days are the fastest lever: two days at home cut 40% of the bill with zero moving boxes.
- A commute isn’t pure cost — some people decompress, listen, think in those minutes. The math doesn’t judge; it measures. What those hours are worth is still your call.
Your cost per mile comes out of the true cost of owning a car, and your hourly value out of the real hourly wage — the two ingredients of this page, ready-made. Meanwhile, try removing just one office day per week above: it’s the most negotiable number on the page.