How to calculate Sling capacity and Sling angle calculation formula

Updated: May 17


Sling WLL at specified angle = Sling WLL x No. of legs x Sling angle factor




Example:- Sling (WLL) = 2000kg

Sling angle = 60 degree

No. of legs = 2

Sling capacity (WLL) at a 60-degree angle?


Now, put these value in the above formula


Sling WLL at a 60-degree angle = 2000kg x 2 x 60 degree

= 2000kg x 2 x 0.866

= 3464kg


Note:- if we consider a 60-degree angle for sling then the reduction factor is 0.866 as per the chart.


Consider, we don't know the sling angle then how we can calculate the sling angle factor?


Sling angle factor = H/L ( H - Height & L- Length)

= 1/1.2

= 0.83