Rigging Sling Calculator

Sling capacity from load weight and sling angle.

Load weight (lb)

Number of legs

Sling angle (deg)

Safety factor

Tab to move between fields

Load per leg (lb)

2,887

Required WLL (lb)2,887

Breaking strength (lb)14,435

Wire rope dia (in)0.6

Angle factor1.16

Min Sheave Dia12

How to Use This Calculator

Enter the total load weight (lb) to be lifted.
Select the number of sling legs (1 = vertical, 2 = bridle, 3–4 = basket configurations).
Set the sling angle (deg) — the angle from horizontal; avoid angles below 30° which dramatically increase leg tension.
Enter the safety factor (5:1 is standard for wire rope per ASME B30.9).
Review Load per leg (lb) and Required WLL (lb) to select the correct sling, and use Wire rope dia (in) as a sizing reference.

How the result changes with Load weight (lb)

Load weight (lb): Total weight of the load being lifted.
Number of legs: Number of sling legs (1=vertical, 2=bridle, etc.).
Sling angle (deg): Angle of sling from horizontal (60 degree min recommended).
Safety factor: Design safety factor (5:1 standard for wire rope).

Identify Input Parameters
4 parameters
Load weight (lb) = 5000, Number of legs = 2, Sling angle (deg) = 60, Safety factor = 5 = 4 input(s) provided
Calculate Load per leg
Load per leg = (loadWeightLb / effectiveLegs) * angleFactor
2887 = 2887
Calculate Required WLL
Required WLL = round(loadPerLeg)
2887 = 2887
Calculate Breaking strength
Breaking strength = round(requiredWLL * safetyFactor)
14435 = 14435