Jobsite Calculator
Counterweights
Counterweight Calculator
For topside outrigger beams. OSHA safety factors. Calculates required CW per beam (stirrup) and shows fulcrum working load for mounting on dollies or scaffold frames.
Results
| Rating Mode | Required CW (lb) | CW (qty) |
|---|---|---|
| Personnel (4:1) | — | — |
| Material (2.5:1) | — | — |
“Required CW (lb)” shows exact pounds. Quantity rounds up to 50 lb plates.
B/O Ratio
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Fulcrum Reactions (from counterweights only)
No OSHA safety factor applied to reactions. Used to size dollies/frames. Verify on approved drawings.
Formulas: Total = L × (B + R) ÷ B • Per leg = Total ÷ 2
Total (both legs):—
Per leg:—
—
Important: Keep the outreach-to-backspan ratio ≥ 1.5 : 1. When using 1500 lb hoists, outreach must not exceed 3.5 ft on a standard beam and 5 ft with a cable truss. Follow the manufacturer’s manual or approved drawings and use under the supervision of a competent person.