Sling Angle Calculator
Calculate how sling angles reduce safe working loads. As the included angle increases, the tension in each sling leg rises and the effective SWL drops.
Sling Angle Calculator
BS 7121Enter the sling configuration to calculate SWL reduction, tension factor, and mode factor.
Results
Angle from Vertical
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Tension Factor (TF)
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SWL Reduction
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Mode Factor
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Maximum Load
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UK Standard Mode Factors (LEEA)
Mode factors used to calculate multi-leg sling capacity from single-leg SWL.
| Configuration | Mode Factor |
|---|---|
| Single vertical | 1.0 |
| Choke hitch | 0.8 |
| Single basket | 2.0 |
| 2-leg 0-90 degrees | 1.4 |
| 2-leg 90-120 degrees | 1.0 |
| 3/4-leg (even load) | 2.1 |
| 3/4-leg (uneven load) | 1.4 |
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