Chain Sag Calculator


In the realm of engineering and physics, understanding the sag in a chain is crucial for various applications, from designing suspension bridges to calculating the weight distribution in a pulley system. A sag calculator helps in precisely determining this sag, ensuring structural integrity and optimal functionality.

How to Use

Using a chain sag calculator is straightforward. Simply input the necessary parameters such as the length of the chain, the weight it supports, and the distance between supports. After entering these values, click on the “Calculate” button to obtain the sag measurement.


The calculation of chain sag involves a precise formula to ensure accurate results. The formula is:


  • S is the sag in the chain.
  • W is the weight supported by the chain.
  • L is the length of the chain between supports.
  • T is the tension in the chain.

Example Solve

Let’s consider a scenario where a chain with a length of 10 meters supports a weight of 500 Newtons, with a tension of 100 Newtons.

Using the formula:


So, the sag in the chain is 6.25 meters.


Q: What units should I use for input values?
A: It’s essential to maintain consistency in units throughout the calculation. Typically, meters and Newtons are used for length and force, respectively.

Q: Can the calculator handle different materials and shapes of chains?
A: This calculator assumes uniformity in the chain material and shape. For accurate results, ensure that the chain properties remain consistent.

Q: Is there a limit to the length of the chain the calculator can handle?
A: The calculator can handle varying chain lengths, but for extremely long chains, factors like elasticity may need to be considered for precise results.


A chain sag calculator is a valuable tool for engineers, architects, and anyone involved in designing structures or systems where chains are integral components. By accurately determining the sag, it aids in ensuring safety, efficiency, and optimal performance.

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