Fabric Shrinkage Calculator – (in Percentage)

Last Updated on August 23, 2023

Fabric Shrinkage Calculator: Have you ever purchased a new garment only to find it fitting a bit differently after the first wash? Fabric shrinkage is a common phenomenon that many of us encounter, and understanding how to calculate it can save us from unexpected surprises.

Thankfully, the Fabric Shrinkage Calculator comes to the rescue, offering a simple way to measure the increase or decrease in fabric dimensions after washing. Let’s dive into the ins and outs of this calculator and discover how it can help you make more informed decisions about your textiles.

What is shrinkage test in textile?

Fabric Shrinkage

Imagine buying a new shirt that fits perfectly but it feels a bit smaller after the first wash. That’s where the shrinkage test comes in. In textiles, fabrics can shrink when they get wet.

This test helps us figure out how much a fabric might shrink after washing. Before making many clothes, we test a small piece of fabric to see how much it shrinks.

Then, we use that information to adjust the patterns for making clothes so they still fit nicely even after washing them.

Fabric Shrinkage Calculator

The Fabric Shrinkage Calculator is a handy tool that lets you determine the percentage increase or decrease in fabric dimensions after washing.

It’s a fantastic way to predict how your favorite garments or fabrics might change in size, allowing you to plan ahead or adjust your washing methods accordingly.

What is the standard for fabric shrinkage?

The standard for fabric shrinkage is typically defined by the fabric’s percentage change in length before and after laundering.

Generally, if the fabric shrinkage percentage is below 2-3%, it is acceptable to consumers. However, if the shrinkage percentage exceeds 3%, the fabric will likely be rejected due to excessive shrinkage.

How is fabric shrinkage calculated? – How to calculate shrinkage

Using the Fabric Shrinkage Calculator is a breeze. Here’s a step-by-step breakdown:


Cut a small square of fabric from your material, ensuring it represents the whole. Record the measurements of the square in the “Before Wash” field on the calculator.

Washing Process

Follow the care instructions for the fabric and wash and dry it accordingly. After washing, measure the square again and note down the measurements in the “After Wash” field on the calculator.

Calculating Shrinkage Percentage – Fabric Shrinkage Formula

Now comes the interesting part. To find the percentage increase or decrease in size, you can use the following Fabric Shrinkage Formula:

For Percentage Increase: Percentage Increase = ((After Wash – Before Wash) / Before Wash) * 100

For Percentage Decrease: Percentage Decrease = ((Before Wash – After Wash) / Before Wash) * 100

Conversion Made Simple

The calculator also explains how to convert between decimals and percentages to make things even more seamless. If you’re dealing with decimals, multiply by 100 and add the percentage sign.

For example, 0.876 becomes 87.6%. Conversely, if you have a percentage and need a decimal, remove the percentage sign and divide by 100. So, 15.6% becomes 0.156.

Putting It All Together – Shrinkage Calculator

Imagine you have a fabric square that measures 20 inches before washing and 17 inches after washing. Using the Percentage Decrease formula:

Percentage Decrease = ((20 – 17) / 20) * 100 = 15%

In essence, the fabric shrank by 15% after washing.

FAQ – People Also Ask

Is 5% shrinkage a lot?

Expect a bit of shrinkage in new items, usually a few centimeters. If something shrinks more than 5%, it might be faulty. Secondhand or vintage clothes are safer since they’ve likely been washed, minimizing further shrinkage.

What is the shrinkage of 100% cotton?

It’s normal for 100% cotton clothes to shrink, especially if they’re not pre-shrunk. Pre-shrunk cotton typically only shrinks 2-5%. However, non-pre-shrunk cotton can shrink up to 20% if not handled carefully.

What is the ISO method for shrinkage?

The ISO method for shrinkage involves using a square fabric sample to determine disfigurement or shrinkage after washing. This applies to both “warp” knit (held stationary against the loom) and “weft” knit (drawn over and under “warp” fibers) fabrics.

What is the ASTM method for shrinkage?

The ASTM method for shrinkage assesses yarn shrinkage in skein form when treated with boiling water, dry heat, saturated steam, or solvents. It applies to yarns made from any fiber, provided the yarn’s tex (weight per unit length) is known or can be determined.

Source – https://forums.autodesk.com/t5/moldflow-insight-forum/moldflow-shrinkage-test-method

What is the best shrinkage percentage?

The ideal inventory shrinkage rate, which depends on the industry, generally falls between 1 and 2 percent. Reducing inventory shrinkage is wise to maintain accurate records.

Will 95% cotton and 5% spandex shrink?

Yes, fabrics with 95% cotton and 5% elastane (spandex) will shrink. Cotton is a natural fiber, and when mixed with heat, it and spandex can undergo shrinkage.


The Fabric Shrinkage Calculator is more than just a tool – it’s a key to understanding how your fabrics will behave after a spin in the washing machine. Following a few simple steps and utilizing the provided formulas, you can accurately predict the percentage increase or decrease in fabric dimensions.

This empowers you to care for your textiles more effectively and make well-informed choices when washing and maintaining your beloved garments.

So, next time you’re about to toss your clothes into the washer, remember that with the Fabric Shrinkage Calculator, surprises will be a thing of the past.