Most people know their gas budget but have never added up what commuting actually costs them over a year. Run the math on a fairly typical setup - 20 miles each way, five days a week, 50 weeks a year, a car that gets 25 miles per gallon, gas at $3.50 - and you get 10,000 miles driven just getting to and from work. At that mileage, fuel alone runs about $1,400 a year. Add a maintenance and depreciation allowance of six cents a mile (roughly $600) and $50-a-month parking (another $600), and the total lands around $2,600 a year, or about $217 a month. That works out to $10.40 for every day you actually drive in.
Public transit and biking behave differently in the numbers above, and it is worth understanding why. The calculator treats a transit pass as a flat monthly cost - a typical unlimited pass runs about $100 a month, so $1,200 a year no matter whether your ride is three miles or thirty. Biking is modeled the same way: a flat annual maintenance allowance for tires, tubes, and the odd tune-up, rather than a per-mile figure, since a bike’s wear and tear does not scale with a car’s fuel economy. Walking, obviously, costs nothing. The upshot is that distance barely matters if you are on transit or a bike, but it is the single biggest lever if you drive.
None of this counts your time, which is arguably the bigger number for a lot of commuters. Fifty minutes a day in the car, five days a week, fifty weeks a year, adds up to well over 200 hours annually - close to a full week of your life spent getting to and from a building. If your employer offers even two remote days, rerun your numbers with fewer commuting days and watch the annual figure drop before you decide it is not worth asking for.
What driving to work really costs
Car commuting has three moving parts: fuel, wear and tear, and parking. Fuel is your one-way distance times two for the round trip, times days per week and weeks per year, divided by your car’s miles per gallon, times the price of gas. Wear and tear is harder to see on a receipt, so the calculator applies a flat six cents per mile to cover the accelerated depreciation, tires, brakes, and oil changes that come from putting extra miles on your car. Parking is whatever your building or garage charges per month, multiplied by twelve. Stack those three together and a modest 20-mile round-trip commute easily clears $2,000 to $3,000 a year, and a longer one or a downtown parking garage can push it well past that.
Why transit and biking do not scale with distance
Switch the method to public transit or bike and notice the annual number stops moving even if you change your mileage. That is intentional. A monthly transit pass costs the same whether your commute is four stops or forty minutes, so the calculator uses a flat pass price rather than a per-mile fare. Biking works the same way: your main cost is periodic maintenance, not fuel, so it is modeled as a flat annual allowance instead of scaling with distance. If you want a number that moves with distance, driving is the method to test.
The parking line people forget to add
Parking is the cost most commuters leave out of their mental math because it does not show up at the pump. A $50-a-month spot barely registers day to day, but over a year that is $600, and downtown or airport-adjacent buildings can easily run several times that, meaning parking alone can rival what you spend on gas. If your employer subsidizes parking or offers a pretax transit benefit, plug in the discounted number rather than the sticker rate, since that benefit can meaningfully change which commute method actually wins.
When switching commute methods actually pays off
Compare your current method against transit or biking side by side and the gap is usually bigger than people expect, because a car commute carries fuel, maintenance, and parking all at once while transit and biking mostly carry one flat cost. If your workplace allows even a couple of remote or hybrid days, try lowering the days-per-week input and watch how much of the annual total simply disappears. For a lot of commuters, a two-day-a-week hybrid schedule cuts commuting cost nearly in half, which is worth bringing up the next time flexible work comes up with your manager.