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Civil Engineering

Critical angle and friction angle Calculator

Civil Engineering

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Critical angle and friction angle

Equation and meaning

\[\theta_{c} = \frac{\pi}{4} + \frac{\phi}{2}\]

Relationship between Critical angle and friction angle

Variables in this formula

phi — Angle
Angle SI unit: rad
theta_c — Theta C
Enter this value unless it is the selected unknown.

How to use this calculator

  1. Leave one value emptyThe empty field is automatically treated as the unknown.
  2. Enter known values and unitsChoose N, kgf, dyn, SI or another compatible unit when available.
  3. Review the automatic answerThe result appears immediately and is substituted back into the formula to check the residual.
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