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  3. Sling load
T-03Free calculator

Sling load calculator.

Tension in each sling leg for any load, number of legs and sling angle, with the load factor and warnings.

For 3- and 4-leg slings, common practice is to assume only two legs carry the load unless the rigging is engineered to share it equally. Set legs accordingly.

Method

How it's calculated.

For a symmetrical lift, each leg carries a share of the load that increases as the sling angle to the horizontal decreases:

T = W ÷ (n × sin θ)

The load factor 1 ÷ sin θ is 1.15 at 60°, 1.41 at 45° and 2.00 at 30°. Below 30° tension rises steeply and horizontal forces on the load and lifting points become significant.

Related reading: sling angles and leg loads.

Estimates for planning and education only. Verify against the applicable code edition, manufacturer data and a competent engineer.

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