Angle of Repose Calculator — Fast & Accurate

Angle of Repose Calculator

Calculate the stable slope angle for loose granular materials in degrees and percent.

Free tool • Instant results
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Enter height and base and click Calculate.
What’s this?

The angle of repose (φ) is the steepest angle at which material remains stable without sliding. For a simple pile slope φ = atan(h / l) in degrees.

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Typical Angles of Repose for Common Materials

MaterialAngle of Repose (degrees)Slope Ratio (H:V)
Dry Sand34°1:1.5
Wet Sand45°1:1
Gravel35-40°1:1.2 to 1:1.4
Soil30-45°1:1 to 1:1.7
Wheat28°1:1.9
Corn23°1:2.4