What this calculator does
Angle Of Repose works out steepest stable slope angle for a granular pile from its static friction coefficient. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
Formulaθr = arctan(μs)
The inputs explained
| Field | What to enter |
|---|---|
| Static friction coefficient (μs) | A number. Starts at 0.6. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with static friction coefficient (μs)
Every other input is held at the calculator’s starting values while static friction coefficient (μs) varies. Select any row to load that scenario into the calculator.
How the answer changes with static friction coefficient (μs)