Potência ciclismo (FTP aprox)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The cycling power calculator estimates the power (in watts) a cyclist must generate to maintain a given speed, considering the total mass of the cyclist and bicycle. The formula used is P = K · v³ · mass, where K is a constant (~0.2) accounting for air resistance and friction. This tool is useful for planning endurance training, assessing race performance, or understanding the physical effort required for different speeds.
To use the calculator, input the desired average speed (in km/h) and total mass (cyclist + bicycle). The result shows the estimated power, based on the cubic relationship between speed and air resistance. For example, doubling the speed requires multiplying power by eight due to the K·v³ term. This highlights why even small speed increases demand significantly more effort.
Note that this formula is a simplified approximation. It does not account for factors like gradient, wind, road conditions, or cyclist efficiency. For more precise calculations, consider using specialized software or controlled field tests.
Frequently asked questions
What formula is used to calculate power?
The formula is P = K · v³ · mass, where K is a constant (~0.2), v is speed in km/h, and mass is rider plus bicycle.
Why is speed raised to the third power?
Air resistance increases with the cube of speed, meaning small speed gains require significantly more power.
When should I use this calculator?
Use it to plan cycling training, analyze race performance, or understand the relationship between speed and effort.
Does the calculation account for hills or strong winds?
No. The formula applies to flat terrain and ideal conditions. Hills and wind greatly affect required power.