Enter the diameter of the wire rope, in mm, into the calculator to determine the safe working load (SWL). This calculator is for education purposes only, follow manufacturing guidelines for true SWL values.

SWL of Wire Rope Formula

The following equation is used to calculate the SWL of Wire Rope.

SWL = D^2 * 8
  • Where SWL is the safe working load (kg)
  • D is the diameter of the wire rope (mm)

To calculate SWL, square the diameter of the wire rope, then multiply by 8.

What is a SWL of Wire Rope?


A safe working load of a wire rope is a measure of the total load or weight that a wire rope can safely support during operation. Values greater than the SWL could result in a failure of the rope.

How to Calculate SWL of Wire Rope?

Example Problem:

The following example outlines the steps and information needed to calculate SWL of Wire Rope.

First, determine the diameter of the rope. In this example, the diameter of the rope is measured to be 10mm.

Next, the final and last step is to use the formula above to determine the SWL of the rope.

SWL = D^2 * 8

SWL = 10^2 * 8

SWL = 800kg