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This calculator calculates the power output of a horizontal axis wind turbine given blade diameter and windspeed. This calculator can also calculate the size or windspeed required for a given power output

Enter the numbers you know in any **one** of the units then calculate the number you want

turbine diameter | meters | ||

feet | |||

Wind speed | mph | ||

m/s | |||

Knots | |||

Power In the Wind ^{1} |
Watts | ||

Power Output (Ideal Turbine ^{2}) |
Watts | ||

Power Output (Real Turbine ^{3}) |
Watts |

Notes

Power in the wind is the total kinetic energy in the wind which crosses the rotors every second.

Power output of a theoretically perfect turbine which has an efficiency equal to the Betz limit (59.3%).

Power output of a turbine with a 40% efficiency. This is more typical of real turbines. A very good turbine may do slightly better and a not so good one will be worse.