Interactive Analysis · Cycling Tools
Cycling Power Calculator
Estimate the power needed to maintain a target speed using rider and bicycle weight, gradient, distance, wind, rolling resistance and aerodynamic drag.
Back to Cycling PortalEnter Ride Data
The calculator estimates steady-state power on a constant gradient. It does not include acceleration, braking, cornering or drafting.
kg
kg
%
km/h
km
km/h
Use a negative value for a tailwind.
Advanced assumptions
m²
Effective aerodynamic area.
Crr
kg/m³
%
How the Estimate Works
At constant speed, the rider must supply enough power to overcome gravity, tyre rolling resistance and aerodynamic drag. The calculator then accounts for drivetrain losses.
Rider Power = (Gravity Power + Rolling Power + Aerodynamic Power) ÷ Drivetrain Efficiency
This is a model-based estimate. Real power can differ because of road
surface, rider position, tyre pressure, temperature, altitude, gusting
wind, drafting, drivetrain condition and changes in speed or gradient.