★ COST COMPARISON · EVERYDAY · COMMUTING
Biking saves real money on a 10-mile commute — $2,152.00 a year — but it costs time, honestly counted. At 10 miles one-way, 5 days a week, 48 weeks a year, you travel 4,800 miles a year. The car costs $672.00 of fuel plus $1,800.00 of fixed costs, for $2,472.00 a year. The bike costs $320.00 a year. The saving is $2,152.00 a year — and the time tradeoff is 100 minutes a day by bike against 48 minutes by car, 52 extra minutes a day. Enter your own commute below to see both sides of your tradeoff.
Driving feels free once the car is paid for, because fuel is bought a tank at a time and parking and insurance are paid monthly, out of sight. Biking feels expensive once, when the bike is bought, and then nearly free. Pricing a whole commuting year, both ways, with the same miles and the same calendar, shows which feeling is right — and how many extra minutes a day the cheaper option actually costs.
Annual miles = 2 × one-way miles × days per week × weeks per year. Car fuel = annual miles ÷ mpg × gas price per gallon. Car fixed costs = monthly fixed costs × 12. Car total = car fuel + car fixed costs. Bike annual cost = bike purchase price ÷ bike life in years + yearly maintenance. Annual saving = car total − bike annual cost; a negative saving means the car wins. Time is shown separately and never converted to money: bike minutes per day = round-trip miles ÷ 12 mph × 60, car minutes per day = round-trip miles ÷ 25 mph × 60, using average speeds of 12 mph by bike and 25 mph by car in commuting traffic. The model deliberately leaves out car depreciation, car maintenance, and repairs, which would only widen the bike saving, and it leaves out bike clothing, lights, and locks — small costs that belong in the maintenance figure if you count them.
Setup: 10 miles one-way, 5 days a week, 48 weeks a year, 25 mpg, $3.50 a gallon, $150 a month fixed, $600 bike, 5 years, $200 a year maintenance.
Line 1 — annual miles. 2 × 10 × 5 × 48 = 4,800 miles.
Line 2 — car fuel. 4,800 ÷ 25 × $3.50 = $672.00 a year.
Line 3 — car fixed. $150.00 × 12 = $1,800.00 a year.
Line 4 — car total. $672.00 + $1,800.00 = $2,472.00 a year.
Line 5 — bike annual. $600.00 ÷ 5 + $200.00 = $320.00 a year.
Line 6 — the saving. $2,472.00 − $320.00 = $2,152.00 a year.
Line 7 — the time tradeoff. 20 miles ÷ 12 mph × 60 = 100 minutes a day by bike; 20 ÷ 25 × 60 = 48 minutes a day by car; the difference is 52 extra minutes a day by bike.
Short commute: 5 miles one-way. Annual miles fall to 2,400, car fuel to $336.00, car total to $2,136.00 against the same $320.00 bike cost, so biking saves $1,816.00 a year. The time cost also shrinks: 50 minutes by bike vs 24 minutes by car a day.
Long commute: 20 miles one-way. Annual miles rise to 9,600, car fuel to $1,344.00, car total to $3,144.00 against $320.00, so biking saves $2,824.00 a year. But the time cost grows hard: 200 minutes by bike vs 96 minutes by car a day — over three hours on the bike, which is where most commuters switch to an e-bike or a mixed commute.
Hybrid week: 3 days a week. Annual miles fall to 2,880, car fuel to $403.20, car total to $2,203.20 against $320.00, so biking saves $1,883.20 a year. The fixed $1,800.00 keeps the saving high even on fewer days, because parking and insurance are paid whether the car moves or not.
Expensive gas: $5.00 a gallon. Annual miles stay 4,800, but car fuel rises to $960.00, car total to $2,760.00 against $320.00, so biking saves $2,440.00 a year. Every gas-price spike widens the bike saving without changing anything about the bike.
| Output | Formula | What it means |
|---|---|---|
| Annual miles | 2 × one-way miles × days/week × weeks/year | 4,800 at the defaults — the commuting distance both options cover. |
| Car fuel | Annual miles ÷ mpg × gas $/gal | $672.00 at the defaults — the year's gas bill for commuting only. |
| Car fixed | Fixed $/month × 12 | $1,800.00 at the defaults — parking plus insurance, paid all year. |
| Car total | Car fuel + car fixed | $2,472.00 at the defaults — the full yearly cost of driving to work. |
| Bike annual | Bike price ÷ life years + maintenance/year | $320.00 at the defaults — the full yearly cost of biking to work. |
| Annual saving | Car total − bike annual | $2,152.00 at the defaults — positive means biking wins; negative means driving wins. |
| Time tradeoff | Round-trip miles ÷ speed × 60 | 100 vs 48 minutes a day at the defaults — the honest time price of the saving. |
The comparison is exact for the numbers you enter, but it is deliberately narrow. It counts fuel, parking, and insurance for the car, and purchase price spread over life plus maintenance for the bike. It leaves out car depreciation, car maintenance and repairs, registration, and tolls — all of which would make driving look worse — and it leaves out bike accessories such as lights, locks, and rain gear, which belong in the maintenance figure if you count them. It also charges the full fixed car costs to commuting even if the car is kept for other trips: if you would keep the car anyway, the honest commuting comparison is fuel only, and the saving falls to $352.00 a year at the defaults ($672.00 fuel minus $320.00 bike). Time uses average speeds of 12 mph by bike and 25 mph by car; your route, hills, traffic lights, and fitness move both figures. Weather, safety, showers at work, and carrying capacity are real factors this calculator does not price. Error policy: missing, non-numeric, or out-of-range inputs are reported as errors rather than calculated.
Bright Side Kit. "Bike vs Car Commuting Cost Calculator." https://brightoolbox.com/bike-vs-car-commuting/ Accessed October 24, 2026.$2,152.00 a year at the defaults: 10 miles one-way, 5 days a week, 48 weeks a year. The car costs $2,472.00 a year ($672.00 fuel plus $1,800.00 fixed) against the bike's $320.00 a year. Your saving depends mostly on distance and fixed car costs — enter your own numbers to see yours.
Yes: at 5 miles one-way, biking still saves $1,816.00 a year. Fuel falls to $336.00 and the car total to $2,136.00, but the $1,800.00 of fixed costs keeps the car expensive even on short trips.
Then compare fuel only: $672.00 of fuel minus $320.00 of bike costs, a $352.00 saving a year at the defaults. Parking and insurance are paid whether the car commutes or not, so they should not count against driving if the car stays regardless.
52 extra minutes a day at the defaults: 100 minutes by bike vs 48 by car round trip. That assumes 12 mph by bike and 25 mph by car in commuting traffic. Shorter commutes shrink the gap; a 5-mile commute costs 26 extra minutes a day.
On money, yes — $2,824.00 saved a year — but on time it is 200 minutes a day on the bike. Most 20-mile commuters do better with an e-bike, which holds higher average speeds, or by biking partway and taking transit the rest.
Barely: biking still saves $1,883.20 a year. Miles fall to 2,880 and fuel to $403.20, but the $1,800.00 of fixed costs does not fall with fewer days, so the saving stays close to the full-week figure.
It raises the saving to $2,440.00 a year at the defaults. Fuel alone rises from $672.00 to $960.00 a year, while the bike costs nothing extra. Every gas-price rise widens the bike advantage.
Car depreciation, car maintenance and repairs, tolls, and registration on the car side; lights, locks, and rain gear on the bike side. The car omissions are much larger than the bike omissions, so the real bike saving is usually bigger than the figure shown here.