Engineering Tool · Grade 1960 · DNVGL-ST-E271

WLL & Sling Calculator

Select the right sling set for your load, or look up the WLL of a multi-leg sling by sling angle. Fast — accurate — standards-based.

Load to lift

Weight (tonnes)

Length L (m)

Width W (m)

Length × Width (optional) to compute sling length — object height ignored.

Number of legs

Leg factor k = 3 (3 & 4 legs both ×3 — allows for unequal load)

Sling angle β (from vertical)45°

Good ✓cos(45°) = 0.707

Standard

Construction / rope grade

Offshore container — sling WLL ≥ WLL_min (Table 8-1, 7t floor)

Sling diagram — 4-leg · β = 45°

Recommended sling · 4-leg · β = 45°

Ø26mm

E-5 · Steel core · 1960

SWL per leg

8.7 t

System WLL

18.46 t

Proof load maximum - set

36.92 t

Legs

Enter Length × Width on the left to compute fabrication length.

• Safety factor 5:1 (SWL = MBL/5) — already applied in the table.

• DNV 2.7-1 offshore · sling WLL ≥ WLL_min = 16.95 t (Table 8-1, Rating 12t) · β = 45°.

Quotation aid — does not replace approval by a lifting engineer.