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Calcimator

Wind Shear Calculator

Calculate wind speed at any height from two measurement points.

Inputs

m/s
ft
m/s
ft
ft

Results

Speed at Target Height

7.41 m/s

Shear Exponent (α)

0.19

Power Ratio vs Height 13.26×
Terrain Class3
How to Use This Calculator
  1. Enter the measured wind speed and height for the first reference point (Height 1).
  2. Enter the measured wind speed and height for the second reference point (Height 2).
  3. Input the target height (hub height) in meters at which to estimate wind speed.
  4. Review the calculated Shear Exponent (α), derived automatically from your two measurements.
  5. Review the estimated Speed at Target Height, the Power Ratio vs Height 1, and the Terrain Class.

How the result changes with Wind Speed at Height 2

Wind Speed at Height 2Speed at Target HeightShear Exponent (α)
3.452.87 m/s-0.27
1116.32 m/s0.57
2040 m/s1
2762.74 m/s1.22

What each input means

Wind Speed at Height 1
Measured wind speed at the first height.
Height 1
First measurement height above ground.
Wind Speed at Height 2
Measured wind speed at the second height.
Height 2
Second measurement height above ground.
Target Height
Height at which to estimate wind speed.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Wind Speed at Height 1 = 5, Height 1 = 10, Wind Speed at Height 2 = 6.5, Height 2 = 40 = 5 input(s) provided
  2. Calculate Speed at Target Height
    Speed at Target Height
    7.41 = 7.41
  3. Calculate Shear Exponent
    Shear Exponent
    0.189 = 0.189
  4. Calculate Power Ratio vs Height 1
    Power Ratio vs Height 1
    3.26 = 3.26
  5. Calculate Terrain Class
    3 = 3

Engine last updated . Checked against 1 independently-derived test — how we verify calculators.

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