Field Tools – Sling Load Calculator

Enter the load and the horizontal distance from each pick point to the load's center of gravity (CG). You get each leg's length, angle and tension.

Weight Unit

Length Unit

Total Load (W)

Left pick point to CG (D₁)

Horizontal distance from the left pick point to the CG.

Right pick point to CG (D₂)

Horizontal distance from the right pick point to the CG.

Calculate from

Hook height Leg lengths Compare preset angles

Hook Height above pick points (H)

Terms

Leg: One sling, from the hook down to its pick point. This tool is for two legs on one hook.
Pick point: Where a sling attaches to the load.
Total Load (W): The total weight hanging from the slings.
CG, center of gravity: The point the load balances on. For an evenly loaded item it is the middle.
D₁, D₂: Horizontal (level) distance from each pick point to the CG. Not measured along the sling.
H, hook height: Vertical height of the hook above the pick points.
L₁, L₂, leg length: Length of each sling from the hook to its pick point.
Angle from level: The sling's angle from horizontal. 90° is straight up; a lower angle means more tension.
Tension per leg: The pull in one sling. Compare it with that sling's rated capacity at that angle.
Preset angles: Four reference angles (60°, 50°, 45°, 35°), shown side by side when you choose Compare preset angles. They assume the CG is centered.
Caution below 45°, danger below 30°: This app's own limits, not from a standard. Use your sling chart.
US ton, metric ton: A US ton is 2,000 lb. A metric ton is 1,000 kg (about 2,205 lb).