Bike Commute Savings Calculator
Yearly bike commute savings in dollars and CO2 vs driving.
What it does
Bike commutes pay in two currencies. Wallets keep gas money, lungs keep carbon out of the sky, and both scale with miles.
The tool above prices the year. Ten miles each way, five days, forty eight weeks is 4800 mi, costing $672.00 to drive or $384.00 to ride, saving $288.00 plus 1,939 kg of CO2.
Gas math carries the car side. Miles over mpg times price turns commutes into dollars, with thirsty trucks tripling the case for pedals.
Eight cents a mile keeps bikes honest. Tires, chains, brake pads, and shop tunes add up across thousands of miles.
Carbon closes the pitch. Near four tenths of a kilo per mile makes bike years read in tons for long commutes.
How to use
- Pick imperial (mi) or metric (km).
- Enter one way commute.
- Enter ride days per week.
- Enter car mpg and gas price.
- Read driving cost first.
- Read biking cost and CO2.
Formula
- commute
- One way trip.
- days
- Ride days per week.
- mpg
- Car fuel economy.
- price
- Gas price per gallon.
Biking upkeep runs $0.08 per mile for tires, chains, and shop time. Metric runs the same year miles from km inputs.
Worked example
Example: 10 mi commute by bike
Imperial defaults: 10 mi commute, 5 days, 25 mpg at $3.50. These are also the default values, so the page opens on this answer.
- Commute: 10 mi each way, 5 days, 48 weeks.
- Year miles: 10 x 2 x 5 x 48 = 4800 mi.
- Drive: 4800 / 25 x 3.5 = $672.00 at 25 mpg.
- Bike: 4800 x 0.08 = $384.00 upkeep.
- Saved: 672 - 384 = $288.00. CO2: 4800 x 0.404 = 1,939 kg.
- Tool shows $672.00 driving, $384.00 biking, 1,939 kg CO2 saved.
Reference table
| Commute | Year miles | Drive cost |
|---|---|---|
| 5 mi, 5 days | 2400 mi | $336.00 |
| 10 mi, 5 days | 4800 mi | $672.00 |
| 20 mi, 3 days | 5760 mi | $768.00 |
| 16 km, 5 days | 4772 mi equiv | $668.10 |
Limits
- Money guide only. Time excluded.
- Upkeep averages vary by bike.
- Winter cuts ridable days.
- Safety needs route review.
Common mistakes
- Counting 52 perfect weeks.
- Ignoring bike upkeep entirely.
- Beater mpg for a truck commute.
- No rain gear, then quitting October.
- Forgetting shower time costs.
Try it yourself
Quick checks. Answers sit tucked under each question.
5 mi commute, 5 days?
Year is 5 x 2 x 5 x 48 = 2400 mi. Drive is 2400 / 25 x 3.5 = $336.00. Bike is 2400 x 0.08 = $192.00.
20 mi, 3 days, 30 mpg at $4?
Year is 20 x 2 x 3 x 48 = 5760 mi. Drive is 5760 / 30 x 4 = $768.00.
Questions
Driving cost?
Divide year miles by mpg times price. Here 4800 / 25 x 3.5 = $672.00.
Biking cost?
Multiply miles by $0.08 upkeep. Here 4800 x 0.08 = $384.00.
Yearly savings?
Subtract bike from drive. Here 672 - 384 = $288.00 a year.
CO2 saved?
Multiply miles by 0.404 kg. Here 4800 x 0.404 = 1,939 kg.
Every day realistic?
Yes. Rain, hills, and winter cut ridable days; e-bikes cut effort.
Time counted?
No. Time, sweat, and safety need personal math.