Car vs Bike Cost Calculator
Compare how much a car and a bike really cost over the same distance. Enter annual mileage and the all-in cost per unit for each mode — the calculator shows annual and multi-year savings side by side.
Total savings by cycling over 5 years
£33,000.00
- Annual car cost
- £7,800.00
- Annual bike cost
- £1,200.00
- Annual savings by cycling
- £6,600.00
- Total car cost over 5 yr
- £39,000.00
- Total bike cost over 5 yr
- £6,000.00
Multiplies your annual distance by each mode's all-in cost per unit (fuel, insurance, depreciation, maintenance for the car; maintenance, gear, and depreciation for the bike), then compounds over 5 years. No interest or inflation adjustment — use the same currency for both rates.
How to use this calculator
Enter your annual distance in whichever unit you prefer — miles or kilometres — then enter the matching all-in cost per unit for the car and the bike in the same currency. All-in means fuel, insurance, depreciation, maintenance, tax, parking, and any other running costs, divided by the distance you cover each year. A sensible starting point for a mid-size petrol car is around $0.65-$0.75 per mile (roughly the US IRS 2026 business mileage rate and the AAA "Your Driving Costs" average). A typical commuter bike works out to around $0.05-$0.15 per mile, mostly maintenance, replacement parts, and gear. Set the years compared to whatever horizon matters to you — 1 year for a quick sanity check, 5 for a mid-term view, 10 for a long-run ownership comparison.
How the calculation works
The maths is straightforward multiplication. Annual car cost = distance × car cost per unit. Annual bike cost = distance × bike cost per unit. Annual savings by cycling = annual car cost − annual bike cost. Multiply each annual figure by the years compared to get the total across the horizon. The calculator does not apply inflation, interest, or a discount rate — the figures are in current-money terms, so a $1,000 saving in year 5 is treated the same as a $1,000 saving in year 1. If you want a discounted or inflation-adjusted view, use a separate present-value calculator on the annual savings. The "cost per unit" figures are the load-bearing inputs — if your car cost per mile is off, the whole comparison is off, so it is worth tracking real running costs for a few months before trusting the default.
Worked example
A commuter drives 12,000 miles a year at an all-in car cost of $0.65 per mile, and rides a bike at $0.10 per mile for the same trips, comparing over 5 years. Annual car cost = 12,000 × $0.65 = $7,800. Annual bike cost = 12,000 × $0.10 = $1,200. Annual savings by cycling = $7,800 − $1,200 = $6,600. Total over 5 years: car $39,000, bike $6,000, savings $33,000. In practice most people cannot replace 100% of car miles with a bike — if only half the miles are cyclable, roughly halve the savings estimate. The comparison is still useful for setting an upper bound on what switching your commute is worth.
Frequently asked questions
What is a realistic all-in cost per mile for a car?
For a mid-size petrol car in the US, the AAA "Your Driving Costs" report typically lands around $0.70-$0.80 per mile once you include fuel, insurance, depreciation, maintenance, and finance costs. The US IRS 2026 standard business mileage rate is $0.70 per mile, which is a decent proxy for total operating cost. In the UK, HMRC approved mileage rates are 45p per mile for the first 10,000 business miles and 25p thereafter — those are a bit lower than true all-in cost because they are a tax approximation. If you own a larger SUV or a newer luxury car, budget closer to $0.90-$1.10 per mile. If you drive an older paid-off compact and skip comprehensive insurance, you might be closer to $0.40 per mile. The right number is the one that matches your specific vehicle and driving pattern — the calculator does not care about the currency, it just multiplies.
What is a realistic all-in cost per mile for a bike?
A typical commuter bike works out at $0.05-$0.15 per mile. The main components are annual maintenance (chains, tyres, brake pads, drivetrain service — call it $150-$400 a year), replacement parts every few years, and gear (lights, lock, helmet, wet-weather kit — amortised over their life). If you spread a $1,500 bike over 5 years and 3,000 miles a year, that adds about $0.10 per mile in depreciation on top of the running costs. Electric bikes are more expensive to run than pedal bikes — budget $0.15-$0.30 per mile all-in due to battery replacement and higher purchase price. If you cycle heavily and buy premium components, your true cost can climb toward $0.20 per mile. Bikes still come out dramatically cheaper than cars by a factor of 5 to 10.
Does this calculator work in kilometres and pounds?
Yes — the calculator is unit-agnostic. It just multiplies distance by cost per unit and adds the results, so whatever unit you enter for distance must match the unit in your cost-per-unit figures. If you enter kilometres, use cost per kilometre. If you enter miles, use cost per mile. The currency is whatever you want — the calculator does not care about $, £, €, or any other symbol, it treats all figures as plain numbers and displays them with your locale currency style in the results. Just be consistent: do not mix miles and kilometres, and do not enter the car in dollars per mile and the bike in pounds per kilometre.
Does the calculator account for the health benefits of cycling?
No — this is a pure cost comparison. Cycling has documented health benefits (reduced risk of cardiovascular disease and type 2 diabetes, plus mental-health benefits) that translate into lower medical costs and higher productivity, but those effects vary hugely by person and are hard to price. Some public-health studies estimate the health value of cycling at $0.30-$0.80 per mile in benefit terms, which would tilt the comparison even further in favour of the bike. If you want to include that value, add your own estimate to the "car cost per mile" figure as a proxy — or interpret the calculated savings as a lower bound on the true benefit of switching modes.
What about time — cycling takes longer than driving, right?
It depends on the trip. For urban commutes under 5 miles / 8 km, cycling is often the same speed as driving or faster once you count parking and traffic. For 5-15 miles / 8-24 km, a car is usually faster in absolute terms, but the cycling time replaces separate exercise time you would otherwise spend at the gym. Over 15 miles / 24 km, a car wins on speed for most people. The calculator does not price time — if your time is worth $30/hour and cycling adds 30 minutes per trip over 250 trips a year, that is $3,750 a year in "cost of time" which might well erase the money savings for longer commutes. For short commutes the time cost is negligible or even negative (cycling replaces gym time).
Should I include car depreciation and insurance if I already own the car?
Yes, if you are deciding whether to sell the car after switching to a bike. Depreciation, insurance, tax, and finance charges continue whether you drive 12,000 miles a year or 1,000 — the marginal cost of a mile driven is really just fuel and wear, maybe $0.15-$0.25 per mile for a modern car. If you cannot or will not sell the car, use that lower marginal figure to see the true financial impact of cycling more. If you are considering going car-free entirely, use the full $0.65-$0.75 per mile all-in figure because the fixed costs go away with the car. This distinction is called "marginal vs total cost" and it is the single most common mistake people make in this comparison.