Bike Commute Savings Calculator
What cycling to work saves against driving — with the fixed costs excluded unless the car genuinely goes away, which most versions of this get wrong.
Why most versions of this overstate it
- The question is whether the car goes away. If it stays on the drive, you save fuel and wear — real, and modest. Insurance, tax and depreciation are paid whether it moves or not.
- Quoting a full per-kilometre motoring cost to someone who still owns the car is the standard trick in this genre, and it inflates the answer several-fold.
- Parking is often the largest single line, and the one people forget to enter.
- The money is rarely the real reason anyway. Most people who stick with it do so because the ride is the best part of the day, not because of the arithmetic — and that is a perfectly good reason the calculator cannot show.
How to use
- Enter your one-way distance and how often you commute.
- Answer honestly whether this removes a car from the household.
- Add parking, which is often the largest single line.
- Read the breakdown rather than only the headline figure.
Frequently asked questions
Why does it ask whether the car goes away?
Because it changes the answer by a factor of three or more, and it is the question most calculators of this kind skip. If the car stays on the drive, you save fuel and the wear those kilometres caused. Insurance, tax and depreciation are paid whether it moves or not, so they are not savings.
Is quoting a full per-kilometre motoring cost dishonest, then?
For someone who still owns the car, yes, in effect. Published per-kilometre figures average in all the fixed costs, so applying them to a commute that does not remove a vehicle overstates the saving several-fold. That is the standard trick in this genre and this tool refuses it by default.
What is usually the biggest line?
Paid parking, where it applies — it frequently exceeds the fuel by a wide margin and is the item people forget to enter. After that, fuel. Servicing and tyres attributable to the distance are real but small.
How is the bike cost worked out?
Consumables per kilometre — chain, tyres, brake pads, servicing — plus the purchase spread over the bike's expected life. Both matter: a commuting bike is a depreciating asset like any other, and pretending it is free is the mirror image of the mistake the driving side makes.
What if the payback never arrives?
Then the tool says so rather than printing a flattering number. At short distances with an expensive bike and a car you are keeping, the money case genuinely does not work — and it can still be the right decision. It just is not a financial one.
Does this account for time?
No, deliberately. Cycling is often faster door to door in city traffic and often slower elsewhere, and valuing the difference depends on whether you would otherwise have exercised — which turns a commute into training and makes the comparison something a calculator cannot settle.
Should the money be the reason?
It rarely is, for the people who stick with it. Most say the ride is the best part of the day, which is not something this can show. The arithmetic is worth doing so the decision is made with the real number rather than an inflated one, in either direction.
🔒 This tool runs entirely in your browser. Nothing you enter is uploaded, logged, or stored.