Free to use, no account
Cycling power calculator
Estimate the steady power needed to ride at a chosen speed. Adjust total rider-and-bike mass, road gradient, headwind, rolling resistance, drag area, air density and drivetrain efficiency.
How is cycling power estimated?
The model adds aerodynamic drag, rolling resistance and climbing force at your ground speed, then adjusts for drivetrain efficiency. On level ground, a 30 km/h ride with an 85 kg system, 0.32 m² drag area and default conditions takes about 146 W at the rider. Real power varies with posture, tires, surface, gusts, drafting, acceleration and measurement location.
Frequently asked questions
How is cycling power estimated?
The model adds aerodynamic drag, rolling resistance and climbing force at your ground speed, then adjusts for drivetrain efficiency. On level ground, a 30 km/h ride with an 85 kg system, 0.32 m² drag area and default conditions takes about 146 W at the rider. Real power varies with posture, tires, surface, gusts, drafting, acceleration and measurement location.
Are my cycling details uploaded?
No. The estimate runs in your browser. Your ride inputs are not uploaded or saved by this tool.
What changes cycling power the most?
At higher speeds, aerodynamic drag often becomes a major part of the estimate. Gradient and total mass strongly affect climbing demand; wind, rider position, tires and surface also matter.
Does this predict my power-meter reading?
No. It is a simplified physics estimate. A calibrated power meter measures power at its own location, while this calculator cannot model every rider, bike, road or weather condition.