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Bike Commute Savings Calculator

Enter your commute distance and how often you ride to see how much you save by cycling.

How it is calculated

The tool counts the miles you would no longer drive in a year, then prices them and converts them to CO₂. annual miles = one-way distance × 2 × days per week × weeks per year (the 2 covers the return trip). money saved = annual miles × cost per mile, monthly saving = money saved / 12, and CO₂ saved (kg) = annual miles × grams CO₂ per mile / 1000.

All five fields are yours to set: distance in miles, driving cost per mile in dollars and emissions in grams of CO₂ per mile (the defaults are 0.65 and 404). Nothing is subtracted for the bike's own costs, and the weeks and days are not checked against a calendar, so an impossible value such as 8 days a week is accepted. Any empty field or negative number gives no result. The $ is a display symbol; use your own currency per mile if you prefer, keeping the units consistent.

Worked example

You ride 6 miles each way, 4 days a week, for 46 weeks a year, and a mile of driving costs 0.60 with 404 g of CO₂. Annual miles: 6 × 2 × 4 × 46 = 2,208 miles. Money saved: 2,208 × 0.60 = $1,324.80 a year, which is $110.40 a month. CO₂: 2,208 × 404 / 1000 = 892.03 kg a year. Cycling one extra day a week (5 days instead of 4) would add a quarter to each of these totals.

Try this example →

Common mistakes

  • Entering the round-trip distance in the distance field. The tool already doubles the one-way figure, so a 12-mile round trip typed as 12 gives twice the real savings.
  • Using kilometres. The distance, cost and emissions are all per mile; a 10 km ride is about 6.2 miles, and per-km costs must be converted too.
  • Counting weeks without holidays and sick days. 52 weeks assumes every week is a cycling week, so a lower number such as 46 is more honest.
  • Using only fuel as the cost per mile. The saving is only as accurate as the figure you enter; parking, maintenance and depreciation belong in it if they would really be avoided.
  • Treating the savings as net. The tool subtracts nothing for the bike, repairs or gear, and it counts every cycled day as a day the car stays at home.

About this calculator

Swapping a car commute for a bike ride removes both fuel/parking costs and a portion of a car's carbon footprint on every trip, and the savings compound quickly over a working year: the US EPA estimates roughly 400 grams of CO₂ per mile for an average gasoline car, while fuel and parking costs add up per mile driven based on local fuel prices and a typical fuel-economy figure.

This calculator takes your one-way commute distance in miles, how many days a week and weeks a year you cycle instead of drive, plus your driving cost per mile (default $0.65) and grams of CO₂ per mile (default 404), and projects both the money and CO₂ you save over a year. Commuters weighing whether to switch to cycling, employers running green-commute or bike-to-work incentive programs, and sustainability-minded individuals tracking their personal carbon reduction use it to turn an abstract 'biking is better' into concrete annual figures.

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  • Editorial team

    The cost per mile you enter decides how realistic the saving is. A full per-mile figure includes depreciation and insurance, which you keep paying if you still own the car. For a cautious estimate, use only fuel, parking and wear. The tool also works in miles, so convert kilometres first by multiplying by 0.62. Do you count the full cost of owning the car, or only the fuel and parking you actually stop paying for?

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