Cycling Power Estimate Calculator
Estimate the power needed to hold a speed on the road from the physics of gravity, rolling resistance and air drag.
Enter your details above and the result will appear here.
How to use
- Enter rider and bike weights.
- Enter your speed and the road gradient.
- Choose your riding position and read the estimated watts.
Note
Model: power = (gravity + rolling resistance + air drag) x speed, divided by 0.97 for drivetrain losses. Air density 1.225 kg/m3 and rolling coefficient 0.005 are assumed. Wind, road surface and drafting change real power a lot. Estimate only — not medical advice.