2-Leg Rigging Calculator
Two pick points, one hook. Enter the distance between your pick points to get the shortest sling you can use, the sling angle, the headroom you need and the load on each leg.
Work out the slings before you hook up.
Results update as you type. Feet and inches take whole numbers, decimals or fractions, such as 6, 6.5 or 6 1/2.
Leg length is hook to pick point, pin to pin. Count the shackles. Assumes the pick points are level and the load's center of gravity is centered between them.
One number gets you started.
Distance between pick points
Measure center to center between the two points you will hook to. This is the only number the calculator must have.
Load weight
Optional. Add it to get the tension on each leg in pounds. Leave it blank and you get the share of the load each leg carries.
Sling leg length
Optional. Enter the slings you have on hand to see the angle they will sit at, the hook height, and whether they clear the 45° minimum.
Flatter slings pull harder.
A sling leg that runs at an angle carries more than half the load. The tension on each leg is the load weight times the leg length, divided by twice the hook height. The lower the hook sits over the load, the more each leg has to carry.
| Sling angle from horizontal | Load on each leg |
|---|---|
| 60° | 57.7% of the load |
| 50° | 65.3% of the load |
| 45° | 70.7% of the load |
| 30° | 100% of the load (flatter than this calculator allows) |
This calculator holds a 45° minimum sling angle. Enter slings that sit flatter than that and it marks them as too flat and tells you the widest spread they can handle.
Planning aid only. This tool does the geometry. It does not check the rated capacity of your slings, shackles, hooks, lugs or crane, and it does not cover off-center loads, pick points at different heights or lifts with more than two legs. Have a qualified rigger check every lift before the load leaves the ground.
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