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eng.wire-rope-safe-load Calculator
Calculates wire rope safe working load, breaking strength, and design factor from rope diameter and grade. Wire rope safety factors range from 3.5 (hoist, steady lift) to 8.0 (sling supporting personnel) — the factor accounts for dynamic loads and degradation.
Inputs
Rope Diameter Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Breaking Strength Kn
Reference formula or conversion factor shown for context.
Safety Factor
Strength divided by expected load. FoS of 2 means the structure can take twice the design load. Lifting equipment: 4–6. Buildings: 1.5–3.
Sheave D To Rope Ratio
Reference formula or conversion factor shown for context.
Results
safe working load SWL (kN)
Sample size or count used in the calculation.
SWL with bending efficiency (kN)
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
bending efficiency factor
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
minimum SF for rigging
The smallest value in the dataset or feasible range.
SWL = breaking strength / SF
Sample size or count used in the calculation.
discard criteria
Reference formula or conversion factor shown for context.