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Angle of Repose

Tipping or dumping angles for common materials like ashes, sand, earth, shingles and more.

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Stockpile - tipping or dumping angle

The angle of repose, or critical angle of repose, of a granular material is the steepest angle of descent or dip relative to the horizontal plane to which a material can be piled without slumping. At this angle, the material on the slope face is on the verge of sliding. Angle of repose - angle where materials will slide out of the tipped body - for some typical products:

of Repose
Ashes, dry 33
Ashes, moist 36
Ashes, wet 30
Asphalt 45
Brick 40
Cinders, dry 33
Cinders, moist 34
Cinders, wet 31
Cinders and Clay 30
Clay 45
Coal, hard 24
Coal, soft 30
Coke 23
Concrete 30
Earth, loose 28
Earth, compact 50
Garbage 30
Gravel 40
Ore, dry 30
Ore, damp or fresh mined 37
Rubble 45
Sand, dry 35
Sand, damp 40
Sand, with crushed stone 27
Shingles 40
Stone 30
Stone, broken 27
Stone, crushed 30
  • repose angle - the angle between the horizontal plane and the side of the pile

repose angle

Stockpile height vs. diameter and repose angle

Download and print Stockpile Height vs. Diameter and Angle of Repose Chart

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