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Wind Dynamic Pressure and Projected Force

Calculate wind dynamic pressure and projected force with local equations, selectable units and supported inverse relationships.

  • Formula & worked example
  • Private in your browser
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

dynamicPressure = 245; windLoad = 490. Values use the worked example unit selections.

q = ρV²/2; F = qA sin θ

Worked example

Enter these known values and leave the other values blank.

Wind velocity
20 m/s
Air density
1.225 kg/m³
Surface area
2 m²
Surface angle
90 deg
Dynamic pressure
245 Pa
Wind load
490 N

Assumptions and limitations

  • This is a unit-coefficient projected-area estimate, not a structural wind-code design. The angle is between the surface and wind direction, with 90 degrees facing the flow. No drag coefficient, gust, terrain or shielding factors are supplied.
  • Unit selectors convert known physical quantities. Leave a supported unknown blank; derived inverse branches are limited by the stated model and available captured equations.

Common questions

What does this calculation assume?

This is a unit-coefficient projected-area estimate, not a structural wind-code design. The angle is between the surface and wind direction, with 90 degrees facing the flow. No drag coefficient, gust, terrain or shielding factors are supplied.

Can I solve for an input?

Where the captured model supplies an inverse, leave that quantity blank and enter the remaining known quantities. A positive square-root or principal trigonometric inverse may represent only one of multiple mathematical branches.

Which unit should I use for the worked example?

The example uses the initial metric unit selection beside each field. Change a unit using its selector to convert the same known quantity; switching a unit does not change the underlying physical value.

References

Restrict the physical model to non-singular dimensions and stated principal inverse branches; discrete gear/fringe counts are exact integers. Bookify uses exact customary mass and volume definitions for density units, replacing rounded factors in the reference. Pounds-force per square inch use the exact international pound and inch with standard gravity, replacing the rounded captured factor. One technical atmosphere is exactly one kilogram-force per square centimeter under standard gravity. Pounds-force per square foot use the exact international pound and foot with standard gravity. The pound-force uses the exact international pound and standard gravity instead of the rounded captured factor.

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