Calculate bike speed from cadence, gearing and wheel size.
Speed is the product of cadence and development, where development is the gear ratio multiplied by wheel circumference. Gear inches expresses the same thing as the wheel diameter a penny-farthing would need. Riders have a narrow optimal cadence range, so gearing rather than leg speed is what sets achievable speed on any gradient.
Bike Speed
Speed = gear ratio × wheel circumference × cadence, converted to km/h
These figures are estimates based on population-average formulas and are intended for training and recreational planning only. They are not medical advice. Consult a qualified health professional before starting or changing an exercise programme, particularly if you have an existing medical condition.
Speed = gear ratio × wheel circumference × cadence, converted to km/h Speed is the product of cadence and development, where development is the gear ratio multiplied by wheel circumference. Gear inches expresses the same thing as the wheel diameter a penny-farthing would need.
Riders have a narrow optimal cadence range, so gearing rather than leg speed is what sets achievable speed on any gradient.
This calculator takes 4 inputs: Cadence, Chainring teeth, Sprocket teeth, Wheel circumference. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.