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Wind Energy Calculators

Tip Speed Ratio Calculator

Tip speed ratio of a wind turbine, and the rotor speed that gives the optimum value.

Enter values

Results update as you type.

Result

Tip speed ratio

3.927

Tip speed
31.42 m/s
Tip speed in km/h
113.1
Assessment
Moderate
Optimal TSR for 3 blades
7

About the Tip Speed Ratio Calculator

Tip speed ratio of a wind turbine, and the rotor speed that gives the optimum value.

Also known as: tsr calculator, turbine rpm calculator, blade tip speed, optimum tsr.

How to use this calculator

  1. Enter calculate, rotor diameter, wind speed and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

TSR = tip speed ÷ wind speed = 2πrN / 60v

Worked example

Using the values pre-filled in the calculator above:

  • Calculate: Tip speed ratio
  • Rotor diameter = 3 m
  • Rotor speed = 200 RPM
  • Wind speed = 8 m/s

the calculator returns:

  • Tip speed ratio: 3.927
  • Tip speed: 31.42 m/s
  • Tip speed in km/h: 113.1
  • Assessment: Moderate