Wind Energy Calculator
Calculate Wind Power
Formula
P = 0.5 × ρ × A × v³ × Cp, where ρ = air density (1.225 kg/m³), A = πr² (swept area), v = wind speed, Cp = power coefficient (max 0.5927 Betz limit).
Frequently Asked Questions
What is the Betz limit?
The Betz limit (59.3%) is the theoretical maximum fraction of wind energy that can be extracted by a turbine. No wind turbine can exceed this efficiency.
Why does power increase with the cube of wind speed?
Wind power is proportional to v³ because kinetic energy depends on velocity squared, and the mass flow rate through the rotor increases linearly with velocity. Together, P = 0.5ρAv³.