Wind Turbine Calculator

What Is a Wind Turbine Calculator?

Wind turbines convert kinetic energy from moving air into electricity. This calculator estimates power output, real efficiency, revenue, RPM, and torque for horizontal-axis (HAWT) or vertical-axis (VAWT) turbines. Enter blade dimensions, wind speed, loss factors, and electricity tariff to see results instantly.

Power Calculation

First, the swept area depends on turbine type:

• HAWT: $A = \pi \times L^2$ where L is blade length (radius)
• VAWT: $A = D \times H$ where D is diameter and H is height

Available wind power is:

$$P_{\text{wind}} = 0.5 \times \rho \times v^3 \times A$$

With air density ρ = 1.225 kg/m³ and wind speed v in m/s. Real efficiency accounts for all losses:

$$\mu = (1 - k_m)(1 - k_e)(1 - k_{e,t})(1 - k_t)(1 - k_w) \times C_p$$

Output power in kW is $\mu \times P_{\text{wind}} / 1000$. Revenue equals tariff × output power.

RPM and Torque

RPM for HAWT: $60 \times v \times \text{TSR} / (\pi \times 2 \times L)$. For VAWT: $60 \times v \times \text{TSR} / (\pi \times D)$. Torque: $\tau = P_{\text{output}} / \text{RPM} \times 30/\pi$.

For related renewable energy tools, see the Hydroelectric Power Calculator, the Solar Panel Calculator, or the Carrying Capacity Calculator.