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Turbine Efficiency Calculator

Calculate a turbine's power coefficient (Cp) and compare it with the Betz limit.

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Enter actual power output, rotor diameter, wind speed and air density to calculate the power coefficient.

How to use this tool

  1. Enter your values in the fields provided.
  2. Read the instant results below the form.
  3. Copy, download, print, or share your result.

💡 Good to know

All calculations use standard, published formulas and simplified assumptions so beginners can build intuition. For real projects, always consult qualified engineers and site-specific data.

Frequently asked questions

What is a good power coefficient?

Modern turbines achieve Cp of 0.40-0.48 at their optimal wind speed.

Can Cp exceed the Betz limit?

No. The Betz limit (0.593) is a theoretical maximum.

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