Calculate how sling angle affects load tension and lifting capacity. This tool helps make sling angle factors easier to understand for dogging, rigging and lifting assessments.
Tools Suite
Sling Angle & Tension Calculator
Education Tool · Dogging & Rigging
Understand Sling Angle Factors
Adjust the angle and load below to see exactly how sling geometry multiplies leg tension — and why angles matter on every lift.
Load Weight
Total Load10,000 kg
Sling Configuration
Legs Sharing Load
Included Angle (θ)90°
10°60°90°120°160°
Angle Factor
—
2 × cos(θ/2)
Tension / Leg
—
Load ÷ Angle Factor
Effective Legs
2
bearing load
Angle Risk Rating—
10° Safe60° Caution90° Warn120° High160°+ Danger
Live Sling Diagram
Quick Reference Table
Angle (θ)
Angle Factor
Risk
Your Tension
⚠ Educational Tool Only. This calculator does not replace a lift plan or the judgement of a competent person. Always verify WLL against the specific sling or chain tag and current manufacturer data before any lift. Assumes symmetrical lift, equal leg lengths, level pick points, and steady lift. 3/4-leg mode assumes only 2 legs effectively carry the load unless your lift plan specifies otherwise.
