Power to Speed Calculator — Estimate Speed from Watts
Estimate cycling speed from power output accounting for all resistances.
How We Calculate This
Speed from Power Formula
Total power is the sum of three resistance forces multiplied by speed:
- Aerodynamic drag: P_aero = 0.5 x air density x CdA x v^3
- Rolling resistance: P_roll = Crr x mass x g x v
- Gravity: P_grav = mass x g x gradient x v
The calculator uses Newton-Raphson iteration to solve for speed where P_total = P_rider.
Frequently Asked Questions
Related Calculators
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Drag Calculator
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CdA Calculator
Estimate your drag coefficient area from field test data.
Wind Resistance Calculator
Calculate the effect of headwind and tailwind on power requirements.
Last updated: February 2026
All calculations are estimates. Always verify results and consult a professional bike fitter where appropriate.