Rigging Calculator: Sling Load

Know every leg's tension before the pick.

Rigging Calculator is a sling angle and sling load calculator for riggers, crane operators, millwrights, ironworkers and signal persons. Type what you can measure on site and read the tension per leg in seconds, in pounds or kilograms.

INCLUDED CALCULATORS
• Sling tension: 2-leg picks by angle, or by sling length and vertical height, the way you actually measure. Angle factor, horizontal pull on a spreader beam and a colour-coded angle warning.
• Hitch capacity: vertical, choker (with choke-angle reduction) and basket capacity from the rating printed on YOUR sling's tag.
• Angle reference: the tension multiplier table and curve, always in your pocket.
• History: save any result and share it as text.

PRO (ONE-TIME PURCHASE, NO SUBSCRIPTION)
• 3- and 4-leg bridles, with rigid or flexible load sharing.
• Unequal legs / CoG offset: tension on each leg when the centre of gravity is not centred.
• Load weight estimator: steel, aluminium, concrete, water and more, by shape and dimensions.
• Lift plan PDF to hand to the foreman, with room for notes and signatures.
• No ads.

BUILT FOR THE FIELD
• Metric (kg / m) and imperial (lb / ft), switch in one tap.
• Large readable numbers, dark and light themes.
• Works offline. No account.
• Warnings below 45 degrees and a hard alert below 30 degrees, following standard rigging practice.

The app contains ads in the version without Pro. Rigging Calculator is an estimation aid for qualified riggers. Always follow the sling tag, the load chart and your site's rigging plan.

Recent changes:
First release: sling tension per leg, hitch capacity, angle reference and history. Metric and imperial.