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Working Load Limit Calculator Online

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When it comes to lifting equipment, knowing its safe handling capacity is of utmost importance. This is where the concept of Working Load Limit (WLL) comes in, often represented via a calculator to ensure accurate results and safety.

Definition of Working Load Limit

The Working Load Limit refers to the maximum weight a lifting device can safely handle under regular working conditions. Ensuring the load does not exceed this limit is vital to maintaining safety and preventing equipment damage.

Detailed Explanation of the Working Load Limit Calculator's Working

Our Working Load Limit calculator simplifies the process of finding the WLL of different types of lifting equipment. This tool takes the necessary parameters such as diameter, breaking strength, and safety factor for wire rope slings, chain slings, shackles, and hooks. It also includes the width and number of webbing layers for synthetic web slings. The calculator then performs the corresponding formula to output the WLL.

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Formulas and Variables Involved

Different lifting equipment types have unique formulas for WLL calculation. Here is a brief overview:

  1. Wire Rope Slings and Chain Slings: WLL = (Diameter x Breaking Strength) / Safety Factor.
  2. Synthetic Web Slings: WLL = (Width x Safety Factor) / Number of Webbing Layers.
  3. Shackles: WLL = (Diameter x Diameter x Breaking Strength) / Safety Factor.
  4. Hooks: WLL = Breaking Strength / Safety Factor.

The diameter and width are in millimeters, while the breaking strength is in Newtons.

Example of Working Load Limit Calculation

To use the WLL calculator, input the necessary parameters into the appropriate fields. For instance, a wire rope sling with a diameter of 10mm, a breaking strength of 5000 Newtons, and a safety factor of 5 would result in a WLL of 1000 Newtons.

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Applications of Working Load Limit

In Construction

In the construction industry, cranes, hoists, and lifts regularly employ the working load limit to ensure safe operations and prevent accidents.

In Shipping

The shipping industry uses the WLL when loading containers onto ships, ensuring neither the containers nor the loading equipment are overloaded.

In Manufacturing

In manufacturing plants, WLL is used when designing and using lifting equipment, ensuring safety and efficiency in operations.

Frequently Asked Questions

Why is the Working Load Limit important?

The WLL is crucial to ensure the safety of operations involving lifting equipment. It helps prevent equipment failure, accidents, and potential injuries or fatalities.


Understanding the Working Load Limit and its calculation is essential in industries where lifting heavy loads is a routine task. Our WLL calculator provides a reliable and straightforward way to determine the safe load limit for various types of lifting equipment, promoting safety and efficiency in operations.

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