RigMaster: Rigging Calculator
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Description
RigMaster is the rigging calculator built for working riggers, crane operators, and signal persons.
LIFT PLAN PDF (PRO)
Turn any calculation into a one-page lift plan: diagram, inputs, results
Room for notes and three signature lines — prepared by, signature, date
Share it straight to the supervisor from the toolbar
IPAD & UNITS
Universal app — two-column layout on iPad, any orientation
Metric or imperial — kg and metres or lb and feet, switch any time
Live sling diagram with the angle and tension on every leg
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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