Two-leg sling tension calculator
Estimate tension in each of two equal sling legs, with the angle measured from horizontal.
Enter your values
Check this tool fits your task
Two equal legs, centred centre of gravity and a static load only. Not a lifting-plan approval or a calculation for unequal legs, shock loads, choker/basket ratings or multi-leg load sharing.
Your result
Enter your values, or try the example to see how it works.
Calculation breakdown
What to do next
Method and sources
Tension per leg = total load force / (2 × sin(angle above horizontal)). This version accepts 30° to 90° only.
How to use this tool
- Check the scope and collect measured or verified input values.
- Enter values using the displayed units, then calculate.
- Read the result, calculation breakdown and next steps together.
Worked example
20 kN load at 30° above horizontal → 20 kN per leg. Against an entered 15 kN capacity, this is an overload.
The example button fills illustrative values. Where a scope confirmation is shown, check it yourself before calculating.
Method and references
Tension per leg = total load force / (2 × sin(angle above horizontal)). This version accepts 30° to 90° only.
Two equal legs, centred centre of gravity and a static load only. Not a lifting-plan approval or a calculation for unequal legs, shock loads, choker/basket ratings or multi-leg load sharing.
Common questions
Is the angle from vertical?
No. Enter the angle above a horizontal line. A vertical leg is 90° in this calculator.
Can I enter kg as kN?
No. Kilograms are mass, kN is force. Have the lifting planner establish the design load force and relevant allowances.
Does an amber result allow the lift?
No. Even when static tension is within the entered capacity, the complete arrangement needs competent verification.
Public beta · Check the method and inputs with a competent reviewer before operational use.
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