SlopeCalc
Calculator

θ = arctan(percent ÷ 100)

Convert slope percent to degrees

A percent grade and an angle are different representations: 100% equals 45°, not 100°.

Private browser calculation

Choose the known representation

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Calculation mode

Known values and units

Enter signed percent grade.

SlopeCalc handles ideal geometric slope only. It does not determine permissible grades, building-code compliance, accessibility, drainage, traction, structural design, or measurement uncertainty.