Calcolatore Potenza Ciclismo
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Estimated Power
123 W
Estimated Power vs Speed
Formula
How Cycling Power Is Estimated
Power required to cycle comes from three main sources: aerodynamic drag, rolling resistance, and gravity.
Formula
Total Power = P_aero + P_rolling + P_gravity
Where v is speed in m/s, g is 9.81 m/s^2.
Key Insight
Aerodynamic drag increases with the cube of speed, so doubling your speed requires roughly 8 times the power to overcome air resistance.
Esempio Risolto
Riding at 18 mph on flat road, 185 lbs total rider+bike weight.
- 01Speed = 18 * 0.44704 = 8.05 m/s
- 02Mass = 185 * 0.4536 = 83.9 kg
- 03P_aero = 0.5 * 1.225 * 0.2816 * 8.05^3 = 90.0 W
- 04P_rolling = 0.005 * 83.9 * 9.81 * 8.05 = 33.1 W
- 05P_gravity = 0 (flat road)
- 06Total = 90 + 33 + 0 = 123 W
- 07W/kg = 123 / 83.9 = 1.47 W/kg
Domande Frequenti
What is a good watts per kg for cycling?
Recreational: 1.5-2.5 W/kg, competitive amateur: 3-4 W/kg, professional: 5-7 W/kg at threshold.
Why does power increase so much at higher speeds?
Aerodynamic drag grows with the cube of speed. Going from 15 to 20 mph requires roughly twice the power, even on flat ground.
How accurate is this estimate?
This provides a reasonable estimate assuming standard road conditions. Real power depends on wind, drafting, road surface, tire pressure, and rider position.
Impara