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Bus vs driving
Put your days, fare, miles, mileage rate and parking in: bus $80.00 a month vs $520.00 driving.
★ COMPARISONS · COMMUTE · BUS VS DRIVING
Bus vs Driving Commute: $80.00 Bus vs $520.00 Driving
On the defaults — 20 commuting days, a $4.00 bus fare a day, against 30 round-trip miles at $0.70 a mile plus $5.00 of parking a day — the bus costs $80.00 a month against $520.00 for driving, so driving costs $440.00 more. This is the BUS-vs-DRIVING version — a flat daily fare against mileage plus parking — the train-vs-driving-commute page is the TRAIN version — a $12.00 train fare against the same driving costs; the rideshare-vs-owning-car page is the RIDESHARE version — rideshare fares against owning a car; and the work-from-home-vs-office page is the COMMUTE-vs-HOME version — office costs against home-office costs.
What does driving costing $440.00 more mean?
It means that on the defaults — 20 commuting days, a $4.00 bus fare, 30 round-trip miles at $0.70 a mile plus $5.00 of parking — driving costs $440.00 more every month: the bus is 20 × $4.00, which is $80.00, while driving is 20 × (30 × $0.70 + $5.00), which is $520.00. The fare is the whole story in miniature — a bus fare is a flat daily price that does not care how far you ride, while driving charges you for every mile and for parking on top, so the daily driving cost of $26.00 is more than six times the $4.00 fare. The part people get wrong is comparing fuel only: fuel for 30 miles might be $4.00 or $5.00, about the same as the bus fare, but the all-in mileage rate of $0.70 counts wear, servicing and depreciation too, and those are the costs that make driving $440.00 dearer, not the fuel.
Three things to check before you trust the number
Is the round trip really 30 miles? Miles are the swing input on the driving side: the 15-mile branch shows driving at $310.00, while the 60-mile branch shows $940.00, so a 15-mile error in the round trip moves the month by $210.00. Measure the route you actually drive, not the straight-line distance, and count both directions — a 15-mile one-way trip is a 30-mile round trip.
Is $0.70 a fair mileage rate for your car? The mileage rate covers everything the car costs per mile, not just fuel: the no-parking branch still shows driving at $420.00, which is $340.00 above the bus, so even free parking leaves driving far dearer on these numbers. If your car is cheap to run, try $0.50 — driving falls to $400.00 a month — and if it is large or new, try $0.90 — driving rises to $640.00. The break-even fare of $26.00 a day is the number to watch: a fare below it favours the bus, a fare above it favours driving.
What is missing from both sides? This page compares money only, and both sides have extras: driving saves time on some routes and costs time in traffic on others, while the bus gives back the journey for reading but may need a walk at either end and runs to a timetable. If the bus needs a connecting fare, add it to the fare; if driving needs tolls, add them to the parking field. And if you would keep the car anyway for weekends, the mileage rate overstates the saving — only the costs you would actually avoid count toward the decision.
Worked example
On the defaults: 20 commuting days, $4.00 bus fare, 30 round-trip miles, $0.70 a mile, $5.00 parking.
- Bus cost a month: 20 × $4.00 is $80.00.
- Driving cost a month: 20 × (30 × $0.70 + $5.00) is 20 × $26.00, which is $520.00.
- Difference: $520.00 − $80.00 is $440.00, so driving costs $440.00 more.
- Break-even fare: 30 × $0.70 + $5.00 is $26.00 a day — at a $26.00 fare the two sides cost exactly the same.
And the other way: the bus fare behind an $80.00 bus cost is $4.00 a day, the round-trip miles behind a $520.00 driving cost are 30 miles, and the parking behind a $520.00 driving cost is $5.00 a day.
Every branch, checked
- 10 commuting days, same fares and distances: 10 commuting days, same fares and distances: Bus $40.00 vs driving $260.00 — driving costs $220.00 more.
- $2.00 fare, 20 days: $2.00 fare, 20 days: Bus $40.00 vs driving $520.00 — driving costs $480.00 more.
- $6.00 fare, 20 days: $6.00 fare, 20 days: Bus $120.00 vs driving $520.00 — driving costs $400.00 more.
- 15 round-trip miles, 20 days: 15 round-trip miles, 20 days: Bus $80.00 vs driving $310.00 — driving costs $230.00 more.
- 60 round-trip miles, 20 days: 60 round-trip miles, 20 days: Bus $80.00 vs driving $940.00 — driving costs $860.00 more.
- No parking, 20 days: No parking, 20 days: Bus $80.00 vs driving $420.00 — driving costs $340.00 more.
The reverses, worked backwards
- Bus fare behind $80.00 bus cost: $4.00 a day — at $4.00 a day the figures are Bus $80.00 vs driving $520.00 — driving costs $440.00 more.; at the lower neighbor the figures are Bus $60.00 vs driving $520.00 — driving costs $460.00 more.; at the upper neighbor the figures are Bus $100.00 vs driving $520.00 — driving costs $420.00 more..
- Round-trip miles behind $520.00 driving cost: 30 miles — at 30 miles the figures are Bus $80.00 vs driving $520.00 — driving costs $440.00 more.; at the lower neighbor the figures are Bus $80.00 vs driving $450.00 — driving costs $370.00 more.; at the upper neighbor the figures are Bus $80.00 vs driving $590.00 — driving costs $510.00 more..
- Parking behind $520.00 driving cost: $5.00 a day — at $5.00 a day the figures are Bus $80.00 vs driving $520.00 — driving costs $440.00 more.; at the lower neighbor the figures are Bus $80.00 vs driving $480.00 — driving costs $400.00 more.; at the upper neighbor the figures are Bus $80.00 vs driving $560.00 — driving costs $480.00 more..
What the defaults assume
The defaults are 20 commuting days, a $4.00 fare, 30 round-trip miles, a $0.70 mileage rate and $5.00 of parking, so the headline is a typical working month for a 15-mile-each-way commuter. The model is two multiplications on a monthly basis: days times fare for the bus, days times daily driving cost for the car, and the break-even fare is the daily driving cost itself. The fare reverse is checked at $1.00 either side, because $1.00 on 20 days is $20.00; the miles reverse is checked at 5 miles either side, because 5 miles at $0.70 on 20 days is $70.00; the parking reverse is checked at $2.00 either side, because $2.00 on 20 days is $40.00. The model does not include time, tolls, connecting fares, or car costs you would pay anyway — add tolls to the parking field and connecting fares to the bus fare.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Bus cost a month | commuting days × bus fare per day | $80.00 — 20 × $4.00. |
| Driving cost a month | commuting days × (round-trip miles × mileage rate + parking per day) | $520.00 — 20 × (30 × $0.70 + $5.00). |
| Driving extra a month | driving cost a month − bus cost a month | $440.00 — $520.00 − $80.00. |
| Break-even bus fare | round-trip miles × mileage rate + parking per day | $26.00 — 30 × $0.70 + $5.00. |
| Bus fare behind a target bus cost | target bus cost ÷ commuting days | $4.00 — $80 ÷ 20. |
| Round-trip miles behind a target driving cost | (target driving cost ÷ commuting days − parking per day) ÷ mileage rate | 30 miles — ($520 ÷ 20 − $5.00) ÷ $0.70. |
| Parking behind a target driving cost | target driving cost ÷ commuting days − round-trip miles × mileage rate | $5.00 — $520 ÷ 20 − 30 × $0.70. |
| 10 commuting days, same fares and distances | same model | Bus $40.00 vs driving $260.00 — driving costs $220.00 more. |
| $2.00 fare, 20 days | same model | Bus $40.00 vs driving $520.00 — driving costs $480.00 more. |
| $6.00 fare, 20 days | same model | Bus $120.00 vs driving $520.00 — driving costs $400.00 more. |
| 15 round-trip miles, 20 days | same model | Bus $80.00 vs driving $310.00 — driving costs $230.00 more. |
| 60 round-trip miles, 20 days | same model | Bus $80.00 vs driving $940.00 — driving costs $860.00 more. |
| No parking, 20 days | same model | Bus $80.00 vs driving $420.00 — driving costs $340.00 more. |
| Bus fare behind $80.00 bus cost | reverse | $4.00 a day: Bus $80.00 vs driving $520.00 — driving costs $440.00 more. |
| Round-trip miles behind $520.00 driving cost | reverse | 30 miles: Bus $80.00 vs driving $520.00 — driving costs $440.00 more. |
| Parking behind $520.00 driving cost | reverse | $5.00 a day: Bus $80.00 vs driving $520.00 — driving costs $440.00 more. |
| 0 commuting days | same model | Bus $0.00 vs driving $0.00 — exactly even. |
| Negative commuting days | same model | Commuting days — 0 or more. |
| Negative bus fare | same model | Bus fare — $0 or more. |
| Negative round-trip miles | same model | Round-trip miles — 0 or more. |
Who uses this
- A commuter weighing bus against car — $80.00 against $520.00 a month, with the $26.00 break-even fare as the decision line.
- Someone with a short commute — the 15-mile branch shows driving at $310.00, closing the gap to $230.00.
- A driver with free parking — the no-parking branch shows driving at $420.00, still $340.00 above the bus.
- A buyer checking a fare quote — the reverses give the fare, miles or parking behind any quoted monthly cost.
Accuracy & limitations
Figures are the model’s own arithmetic on the numbers you type, computed from unrounded values and displayed rounded HALF_UP to 2dp, on a monthly basis. The main limitation is what is left out, not the arithmetic: time, tolls, connecting fares and car costs you would pay anyway all move the real comparison, and the $0.70 mileage rate is an all-in average, not your exact car. This page is a calculation tool, not travel advice.
Cite this calculator
20 commuting days: a $4.00 bus fare a day costs $80.00 a month vs $520.00 driving (30 miles at $0.70 plus $5.00 parking). Source: Bright Side Kit, https://brightoolbox.com/bus-vs-driving/, accessed 29 October 2026.
Frequently asked questions
Is the bus always cheaper than driving?
Not always: on the defaults the bus wins by $440.00 a month, but the break-even fare is $26.00 a day — a fare above $26.00, or a shorter drive, flips the result. A 15-mile round trip leaves driving only $230.00 dearer.
Why use $0.70 a mile instead of just fuel?
Fuel is only part of driving: the mileage rate also counts wear, tyres, servicing and depreciation, which are real costs even though they arrive as bills rather than at the pump. Fuel alone would understate driving by about $16.00 a day on a 30-mile round trip.
Should I include parking if my employer pays it?
No: if parking is free to you, use zero — the no-parking branch shows driving at $420.00, still $340.00 above the bus on these numbers, so free parking alone does not close the gap.
What is the break-even bus fare?
The daily driving cost: round-trip miles times the mileage rate plus parking, which is 30 × $0.70 + $5.00 = $26.00 a day. Below $26.00 the bus is cheaper; above $26.00 driving is cheaper; at exactly $26.00 the two sides cost the same.
What if I only commute some days a week?
Use your real monthly day count: both sides scale with days, so 10 days halves both the $80.00 bus cost and the $520.00 driving cost, and the gap halves to $220.00.
What about the time each option takes?
This page compares money only. If driving saves 30 minutes a day, that time has a value to you — but it is not in the $520.00, so weigh it separately against the $440.00 monthly gap before deciding.