Ladder Angle Safety Calculator
By Wall Height
Calculate safe ladder placement from wall height
ft
ft
By Ladder Length
Calculate placement from known ladder length
ft
°
Formula
Base Distance = Height / 4 (4-to-1 rule); Ladder Length = sqrt(Height^2 + Base^2); Angle = atan(Height / Base)
Frequently Asked Questions
What is the 4-to-1 ladder rule?
The 4-to-1 rule states that for every 4 feet of height, the base of the ladder should be 1 foot away from the wall. This creates approximately a 75-degree angle, which is the safest angle for ladder use.
How far should a ladder extend above the roofline?
OSHA requires that a ladder extend at least 3 feet above the upper landing surface (such as a roofline) to provide a secure handhold when stepping on and off the ladder.
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