Jobsite Calculators

Platform Capacity

Counterweights

Voltage Drop

Job Site Calculators

Choose a calculator below. You can print results from inside each tool.

Calculator

Platform Capacity Calculator

Values use Sky Climber tables (UL1322) and Work Cage catalog data. Print-ready summary included.

Type & Number of Stirrups Choose the setup you’re actually building. Requested Length Modular sections totaling selected length. Hoist Rating (lb) per hoist Accessories / Rigging (lb) Guardrails, toeboards, connectors, etc. Platform Self-Weight (lb) Auto-filled from the correct Sky Climber table for this mode/length. Planned Live Load (lb) people + tools + materials

Stirrups / Hoist points

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.

Jobsite Calculators

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Voltage Drop Calculator

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