Rope, Rigging & Lifting Calculators

Slings, rigging, lifting loads, WLL and crane calculations.

12 tools · 100% Free · Works Offline

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Sling Angle Load Factor CalculatorWork out how much extra tension a sling angle puts into each leg of a lift. Because a leaning…

Two-Leg Sling Load Share CalculatorSplit a lift between the two legs of a sling and see the tension in each. For a balanced load…

Four-Leg Sling Load Share CalculatorSize the legs of a four-leg lift the way experienced riggers actually do it — on 3 sharing legs…

Wire Rope SWL / Load CheckerCheck whether a lift is within the rated capacity of a wire rope sling, chain, or item of…

All Rope, Rigging & Lifting Calculators (12)

Guide to Rope Calculators

These tools support riggers, dogmen, crane crews and lift supervisors working out whether a sling, chain or wire rope arrangement can safely carry a load. The catch most people miss is that a sling's rated capacity is not the load it actually sees: as the included angle opens up, tension in each leg climbs sharply, and an uneven pick can dump most of the mass onto one or two legs regardless of how many are rigged.

Working out sling tension and angle

Start here to convert a load and a sling geometry into the actual tension each leg carries. Use the load-factor tool for a quick multiplier, then the two- or four-leg share tools when legs sit at different angles or the centre of gravity is off to one side.

Sling Angle Load Factor Calculator Two-Leg Sling Load Share Calculator Four-Leg Sling Load Share Calculator Sling Length for Angle Calculator

Rating the gear: WLL, SWL and capacity

Once you know the tension per leg, check it against the rated capacity of the wire rope or chain. Use the grade-and-angle chain tool for chain slings, the wire rope checker for steel rope, and the breaking-load tool when you only have a break figure and a safety factor to derive from.

Wire Rope SWL / Load Checker Chain Sling WLL (Grade & Angle) Calculator WLL from Breaking Load & Safety Factor Calculator Sling D/d Ratio Efficiency Calculator

Crane and lift planning

For the whole pick, estimate gross mass first, then check how much of the crane's rated capacity you are using and whether taglines can hold the load against wind. The block-and-tackle tool helps where a reeved purchase changes the effective line pull.

Crane Lift Plan Gross Mass Estimator Crane Lift Utilisation Calculator Tagline Wind Force Calculator Block & Tackle Mechanical Advantage Calculator

Important calculation notice

These calculators are intended for education, estimation and preliminary checks. Verify all inputs, units, assumptions, material properties and applicable standards. Safety-critical or final engineering designs should be checked by a suitably qualified professional.

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Rope, Rigging & Lifting Calculators

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All Rope, Rigging & Lifting Calculators (12)

Crane & Lift Planning5 calculators

Sling & Chain Rigging4 calculators

Wire Rope & Load Limits3 calculators

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