Small calculators for questions that come up before you buy a bike or a part for one. Each tool runs in your browser, sends nothing to us and shows the formula it uses, so you can check the math yourself.
- Bike Size CalculatorFrame size from your height, plus a frame and saddle height estimate from your inseam.
- Gear and Speed CalculatorSpeed at a given cadence, gear ratio, gear inches and wheel circumference for your bike computer.
- E-Bike Range EstimatorWatt-hours from your battery label and a realistic range window for how you ride.
How to Use These Numbers
Every result here is a starting point, not a verdict. Brands size frames differently, real tire circumference changes with pressure and load, and e-bike range depends on wind, temperature and the rider. Use the output to narrow your options, then check the maker’s own size chart or spec sheet before you order.
Spotted a formula you think is wrong? Tell us through the contact page and we will look at it.