Methodology guide
Limits, +3 ft rule, and when to stop shopping this ladder.
Calculator
Telescoping ladder size by support height
Enter height to the top support or landing in feet. Get a 13 / 17 / 20.5 ft class or NO_MATCH. Adds 3 ft above landing for straight-extension shopping.
Result
Worked checks: 8 ft → 13 · 12 ft → 17 · 16 ft → 20.5 · 18 ft → NO_MATCH. classLbs uses 13 / 17 / 21 for CTA matching.
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