Ladder Angle Calculator
Construction & Home ImprovementCalculate the angle and working length of a leaning ladder from its reach and base distance, and check it against the OSHA 4-to-1 safety rule.
Ladder Angle
Angle between the ladder and the ground.
Ladder Working Length
20.62
Total length of ladder needed along its slope.
OSHA 4-to-1 Check
Whether the resulting angle falls within OSHA's recommended 70 to 80 degree range around the ideal 75.5 degrees. Within OSHA's recommended range
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Creators
Odeh Ahwal0people find this calculator helpful
Views
Helpful
Saved
Embeds
Construction & Home Improvement calculators
Frequently Asked Questions
What is the OSHA 4-to-1 rule?
OSHA recommends setting a leaning ladder so its base sits one quarter of the ladder's working length away from the wall, for every 4 feet of height place the base 1 foot out. This produces an angle of about 75.5 degrees, the angle that best balances the risk of the base sliding out against the risk of the ladder tipping backward.
Why does the angle matter so much?
Too shallow an angle, base too far from the wall, increases the chance the base slides outward under the climber's weight. Too steep an angle, base too close to the wall, increases the risk of the ladder tipping backward. The 75.5 degree range is the tested safe middle ground.
Does this apply to a self-supporting stepladder?
No, the 4-to-1 rule and this angle calculation apply to a non-self-supporting extension or straight ladder leaning against a wall or structure. A self-supporting stepladder has its own separate stability design and does not lean at an angle in the same way.
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