Ladder Angle & Safe Setback Calculator

Find the safe base distance and working reach for a ladder using the 1-in-4 (75 degree) rule.

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.

building rules differ by state, territory and council. Results are estimates - confirm requirements with your local council or state building authority before you build.