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Rigging Engineering Calculations — Educational Guide (PDF-friendly)

Load: the weight or force applied to the rigging system (static or dynamic).
Working Load Limit (WLL): maximum safe load as rated for hardware.
Safety Factor (SF): ratio of ultimate strength to allowable load; commonly 5:1 for lifting gear unless otherwise specified.
Rated Capacity: WLL × any angle reduction factors.
Center of Gravity (CG): location where load is balanced; rigging must account for CG to prevent tipping.
Dynamic effects: shock or accelerations increase effective load; account with dynamic amplification factors.

NCCCO (National Commission for the Certification of Crane Operators): Their study guides (free samples) include load calculation worksheets.
IPAF (International Powered Access Federation): Offers free technical guidance notes.

Load types: dead load, live load, dynamic/load impact, wind, surge, eccentric load.
Center of gravity (CG) and load distribution.
Wire rope, chain, synthetic sling characteristics.
Rated capacities: Working Load Limit (WLL), Safe Working Load (SWL), Minimum Breaking Strength (MBS).
Factors of Safety (FoS) and design factors (common values: 5 for life-safety lifts, 3–5 depending on standards).
Rigging hardware: shackles, hooks, spreader bars, beam clamps — inspect for rated markings.
Sling angles and effect on tension (sling angle increases tension).