Enter the weight of the swollen hydrogel and the weight of the dry hydrogel into the calculator to determine the swelling ratio.

Hydrogel Swelling Ratio Calculator

Enter any 2 values to calculate the missing variable

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Hydrogel Swelling Ratio Formula

The following formula is used to calculate the swelling ratio of a hydrogel. 

SR = (W_s - W_d) / W_d

Variables:

  • SR is the swelling ratio
  • Ws is the weight of the swollen hydrogel
  • Wd is the weight of the dry hydrogel

To calculate the swelling ratio, subtract the weight of the dry hydrogel from the weight of the swollen hydrogel, then divide the result by the weight of the dry hydrogel.

What is a Hydrogel Swelling Ratio?

The hydrogel swelling ratio is a measure of the ability of a hydrogel to absorb water and swell. It is commonly defined (on a mass basis) as the relative increase in weight upon swelling compared with the dry weight: SR = (Ws − Wd) / Wd. This property is crucial for various applications, including drug delivery systems, wound dressings, and tissue engineering, where the hydrogel’s ability to retain water and swell can significantly impact its performance and functionality. (Some sources instead report the mass swelling ratio Q = Ws/Wd, which relates by Q = SR + 1.)

How to Calculate Hydrogel Swelling Ratio?

The following steps outline how to calculate the Hydrogel Swelling Ratio.

  1. First, determine the weight of the swollen hydrogel (Ws).
  2. Next, determine the weight of the dry hydrogel (Wd).
  3. Finally, calculate the swelling ratio using the formula SR = (Ws – Wd) / Wd.
  4. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Weight of swollen hydrogel (Ws) = 10 grams

Weight of dry hydrogel (Wd) = 2 grams