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Cycling

Gearing, cadence, speed, and cycling power.

Choose the tool whose inputs and output match your task. Check each calculator’s assumptions and limitations before using its result.

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Cycling tools cover the two numbers that matter most on the bike: how the drivetrain translates pedal input, and how much power a given ride requires. The bicycle gear calculator converts chainring and rear-cog tooth counts into gear ratio, gear inches, development, and theoretical speed at a chosen cadence, using a measured wheel rollout for accuracy. When you want to know what a ride costs in effort, the bicycle power calculator combines speed, grade, rolling resistance, aerodynamic drag, and wind into a mechanical power estimate. Use the gear tool when setting up or comparing setups, and the power tool when pacing a climb or a flat stretch. Browse the rest of the Sports & Performance collection.

2 of 2 calculators

Frequently asked questions

How is gear ratio calculated?
For this direct external drivetrain, gear ratio is chainring teeth divided by rear cog teeth. Development is measured wheel circumference multiplied by that ratio, and gear inches is the effective diameter in inches multiplied by the ratio.
How should I measure the wheel rollout?
Inflate the tire to normal riding pressure, mark the tire and ground at the valve, load the bicycle as it is ridden, roll straight for one complete wheel revolution, and enter the distance between the marks as circumference. Use diameter mode only for a directly measured loaded diameter, not a nominal wheel-family label.
What does the speed result represent?
Theoretical speed is development multiplied by cadence and converted from meters per minute to km/h and mph. It is a no-slip rollout result; tire slip, dynamic deformation, drivetrain loss, wind, grade, acceleration, and rider power are not modeled.

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Bicycle Gear vs Bicycle Power CalculatorCompare gear ratio, gear inches, development, and cadence-based speed against a mechanical power estimate from speed, grade, drag, and rolling resistance.Bicycle Gear vs Running Pace CalculatorCompare cycling speed derived from gearing, cadence, and a measured wheel against running pace, time, and distance in miles or kilometers.Bicycle Gear vs Swimming SpeedCompare two speed calculators from different sports: theoretical cycling speed from chainring and cog teeth, cadence, and measured wheel rollout versus average swimming speed, pace per 100 meters, and projected times.Bicycle Power vs Half Marathon PaceCompare two endurance-effort measurements: cycling mechanical power computed from motion and resistance inputs versus half marathon pace from a target finish time, one in watts and the other in time per distance.Bicycle Power vs Running PaceCompare the two canonical endurance-effort metrics: cycling mechanical power in watts from motion and resistance inputs versus running pace, time, and distance in miles or kilometers.Bicycle Power vs Vertical JumpCompare two ways to measure leg power: steady-state cycling mechanical power computed from motion and resistance inputs versus explosive jump height from standing reach and three jump-reach trials.Bicycle Power vs Vertical Speed CalculatorCompare bicycle power and vertical speed: one estimates the watts a cycling scenario needs, the other reports ascent or descent rate — effort versus outcome.

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