SafetyPaperwork
Free tool · United States

Ladder setup calculator

By Safety PaperworkBuilt from OSHA standards and guidance · How we write and check theseUpdated

Enter the height of the landing or support point. The calculator uses the 4 to 1 rule (about 75 degrees): one unit out for every four units up, plus the extension needed above the landing for a safe step off.

What the result means

  • Set the base out one quarter of the working height (the 4 to 1 or "1 in 4" rule, about 75 degrees).
  • If you are stepping off at the top, the ladder must extend above the landing so you have a handhold.
  • Secure the ladder at the top or bottom, on firm level ground, before anyone climbs.
  • Keep three points of contact and do not stand on the top rungs.

Tell the crew

Run the ladder safety toolbox talk and get it signed on the phone.

Open the toolbox talk

Sources

More help

What is a JHA (Job Hazard Analysis)?GuideHow to write a JHA, step by stepGuideFree JHA templateWord and PDFJHA questions answeredSafety terms explainedHeat index calculator for outdoor workFree toolLadder setup calculatorFree toolTrench sloping calculator (OSHA)Free toolWhat changed in 2026Rule changes with sourcesAll United States guidesContact us