Wind Turbine Power Calculator
Power output from wind speed and rotor size.
Enter your values
ⓘ Live results
Results
- Power output
- 12.41 kW
- Swept area
- 113.1 m²
- Annual energy at 30% CF
- 32,623 kWh
- Wind power density
- 314 W/m²
Quick answer
Wind power scales with the cube of wind speed and the square of rotor diameter.
P = ½ρAv³ × Cp
How to use the Wind Turbine Power Calculator
- 1Enter rotor diameter and average wind speed.
- 2Set the power coefficient (Betz limit is 0.59).
- 3Adjust air density for altitude.
Worked example
Using the values the calculator loads with:
Inputs
- Rotor diameter12 m
- Wind speed8 m/s
- Power coefficient0.35
- Air density1.225 kg/m³
Results
- Power output12.41 kW
- Swept area113.1 m²
- Annual energy at 30% CF32,623 kWh
- Wind power density314 W/m²
Frequently asked questions
Why does wind speed matter so much?
Power scales with the cube — doubling wind speed gives eight times the power.
What capacity factor is realistic?
25–35% onshore, higher offshore.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.