About the Wind Power Calculator
Wind energy scales dramatically with speed — doubling the wind gives eight times the power.
This tool applies the physics to estimate a turbine’s output.
How this calculator works
We use P = ½ × air density × swept area × wind speed³ × efficiency to estimate power and annual energy.
Why it matters
- Understand the cube law of wind
- Size a small turbine realistically
- Compare rotor diameters
- Estimate annual energy yield
Frequently asked questions
Power rises with the cube of speed, so small speed gains hugely increase output.
Real turbines capture 35–45% of wind energy; the theoretical Betz limit is 59.3%.