What it does
BikeCalc calculates gear relationships, gear inches, development, gain ratios and speed at a selected cadence.
BikeCalc compares gear ratios, gear inches, development, gain ratios and cadence-based speed in km/h or mph. Keep tyre/wheel dimensions and cadence consistent across setups. Gain-ratio comparisons also use crank length measured centre-to-centre and matching dimension units. The article's opening distance definition is reversed relative to its formula; its table and deployed calculation rule use wheel radius divided by crank length, multiplied by gearing.
Free access saves one configuration on the stated iOS/web offering. BikeCalc+ is presented for iOS with more component controls and unlimited configuration export. The .bkc sharing format is described as beta and email-only. Core iOS functions work offline, while purchases/support need internet. The web version and API/SDK links are beta, so the family should not be read as having identical capabilities on every platform.
Strengths
- Several gearing measures and cadence-based speed calculations
- Tyre-size reference and configuration comparisons
Watch out for
- The free tier saves one configuration; BikeCalc+ adds more saved configurations and other features.
- The gain-ratio article opens with a distance definition reversed relative to its formula.
Best for
- Comparing bicycle gearing setups
Sources
- Bike Gear Calculator For Cyclists | BikeCalc (Oct 26, 2026)
- BikeCalc Gain-Ratio Inputs and Units (Oct 26, 2026)
- BikeCalc Gain-Ratio Definition Inconsistency (Oct 26, 2026)
- Gain Ratios Table | BikeCalc (Oct 26, 2026)
- BikeCalc deployed gain-ratio calculation rule (Oct 26, 2026)