RigMaster: Rigging Calculator

Know every leg's tension before the pick. Sling angles, hitch capacities, CoG offsets, and load weights, calculated in seconds, right at the hook.

RigMaster is the rigging calculator built for working riggers, crane operators, and signal persons.

FREE CALCULATORS • Sling Tension — 2-leg picks by angle, or by sling length & height (the way you actually measure) • Hitch Capacity — vertical, choker, and basket capacity from YOUR sling's tag rating • Angle Reference — the tension multiplier table, always in your pocket

PRO CALCULATORS • 3 & 4-leg bridles with rigid/flexible load sharing • Unequal Legs / CoG Offset — tension per leg when the center of gravity isn't centered • Load Weight Estimator — steel, concrete, aluminum and more, by shape and dimensions • Ad-free

Built on first-principles trigonometry with warnings at 45° and hard alerts below 30°, following standard rigging practice (ASME B30.9 guidance).

RigMaster is an estimation aid for qualified riggers. Always follow the sling tag, the load chart, and your site's rigging plan.

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