Angle of Repose Calculator
Free calculate the steepest angle at which granular materials remain stable without sliding. Get instant, accurate results with our easy-to-use calculator.
Input Parameters
Static friction coefficient between materials
Results
Enter parameters to calculate angle of repose
Angle of Repose Formula
Formula
θ = arctan(μ)
or
θ = arctan(h/r)
Where:
- • θ = angle of repose
- • μ = coefficient of friction
- • h = height of material pile
- • r = base radius of pile
Common Angles of Repose
- • Dry sand: ~30-35°
- • Wet sand: ~45°
- • Gravel: ~30-40°
- • Coal: ~35-45°
- • Wheat: ~27°
- • Corn: ~23°