Methodology guide
Limits, per-shelf vs total, and when to stop shopping this ladder.
Calculator
Garage shelving size by shelf load
Enter the heaviest single-shelf load in pounds. Get a 400 / 500 / 600 lb-per-shelf class or NO_MATCH.
Result
Worked checks: 350 lb -> 400; 450 lb -> 500; 550 lb -> 600; 700 lb -> NO_MATCH. classLbs uses 400 / 500 / 600 for CTA matching.
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