Ladder setup calculator
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.