Sling Tension Calculator: Step-by-Step Guide

Published: September 2025 | By SlingCalc Engineering Team

The sling tension calculator shows the exact force in each sling leg for vertical, basket, and choker hitches. It turns geometry into clear numbers so you can choose the right rigging before the lift.

Inputs You Need

Load weight: The total mass you expect to lift.
Pick point spacing: Distance between sling connection points.
Hitch type: Vertical, basket, or choker affects how force splits.
Sling angle or hook height: Angle changes tension the most.

Running the Calculation

Select the hitch type. SlingCalc adjusts the formula for you.
Enter weight and geometry. Use measured dimensions or quick presets.
Watch the leg tension output and compare it to your sling rating.
Adjust the hook height or add legs until every sling shows a green indicator.

Interpreting the Results

Per-leg tension tells you whether the sling tag rating is enough.
Leg share balance highlights uneven forces when pick points are offset.
Safety factor readout makes it clear when you cross the recommended limit.

Plan Faster with SlingCalc

SlingCalc animates the lift while you type, so you can see tension spike the moment an angle gets shallow. Capture the scenario in a PDF export and attach it to your lift plan so everyone knows the target tension and safe margins on site.

Tip: If one leg keeps turning red, raise the hook or move the pick points closer to reduce tension.