Lifting Sling Load Calculator

Estimate sling leg tension from lifted load, sling count, angle from horizontal, and dynamic factor with visible limitations.

Calculator

Sling load and angle estimate

Lifted loadkNNumber of sling legs sharing loadlegsSling angle from horizontaldegDynamic / impact factorfactor

Result

Sling tension per leg57.74 kN

Design tension per leg63.51 kN

Total design rigging load127 kN

Vertical component factor0.87

Formula

T = W / (n x sin theta), where theta is measured from horizontal.

Assumption

Load share is assumed equal between active sling legs.

Safety

Use only with approved lifting plans, certified rigging, and competent lifting review.

How to use this tool

Enter load, sling arrangement, and lifting angle.

Review load sharing and sling force estimates.

Check practical warnings for risky configurations.

Use results with approved lifting plans and competent review.

Assumptions

The lifted load is shared equally by the active sling legs.

The sling angle is measured from horizontal.

The dynamic factor is applied directly to the calculated sling tension.

Limitations

Does not verify lifting lug strength, shackle capacity, sling WLL, center of gravity offset, spreader beam behavior, or crane capacity.

Does not replace an approved lifting plan or competent lifting supervision.

Formula notes

T = W / (n x sin theta), where T is sling tension per leg, W is lifted load, n is the number of sharing legs, and theta is sling angle from horizontal.