Wire-Rope Breaking-Strength Estimate and WLL
A field estimate of wire-rope minimum breaking strength (construction factor x diameter^2, default 46 tons/in^2 for IPS 6x19, editable) and the working load limit at a design factor (default 5:1). An ESTIMATE only - the manufacturer's certified breaking strength governs, and unmarked or uncertified rope must not be placed in service.
Formula and source
mbs_tons = construction_factor x diameter_in^2 (default 46 tons/in^2 for IPS 6x19); wll_tons = mbs_tons / design_factor (default 5).
Wire Rope Users Manual rule-of-thumb (by name); MBS = factor x d^2, no edition cycle.
Audience
This tile is built for trades and the adjacent professions in the Rigging and Heavy Lift group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.
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Posture
Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.