Ladder Angle and Length Calculator
Works out ladder length and where to set the base.
Ladder length needed
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Base distance from the wall —
Angle — °
Reading this —
The formula
base = height ÷ 4 ladder = √(height² + base²) + extension
One out for every four up gives an angle of about 76°, close to the 75° usually recommended.
What to watch out for
Set it on firm, level ground and secure the top.
Frequently Asked Questions
What is the 4-to-1 rule?
Set the base one unit out for every four units up. For 5 m of height, that is 1.25 m out.