Slope & Grade Calculator

Convert between percentage, ratio and degrees for site falls and slopes.

Estimate only — not a substitute for a licensed tradesperson, a certified engineer, or sign-off from your local building surveyor. Verify against current standards and site conditions before ordering materials or starting work.

Result

Grade: 10%
Ratio (1 in X): 10
Angle: 5.71deg

A rise of 0 is level, and a level surface has no 1-in-X ratio, so the ratio shows 0 in that case. Grade and angle are still correct at 0.

What this is based on

Geometry - converting between percentage, ratio and degrees. The permitted grade for a given application is set elsewhere; this only converts.

We cite the clause and link to the publisher so you can read the source yourself. We do not reproduce the text or tables of the NCC or of any Australian Standard.