Wraps per Inch aka WPI

When you think you have a medium worsted weight yarn but you actually have a sport weight yarn, you can end up with a product that is a very different size than you thought.  Look at the feature picture so you can see what I mean. Both of the yarns I bought were labeled as worsted weight but when I tested them, it turned out that the yellow (10 WPI)  was worsted and the blue was a sport weight (13 WPI) yarn.

Wraps per inch, is a technique used to figure out the weight of yarn. Like if you have scarp yarn with no label, this system  gives you the ability to know the weight with a very simple procedure.

The bad news is that I did not find consistency with the numbers on the chart worldwide. Sometimes the difference between one chart and the other was huge. However, I did find that this was mostly true when I researched organizations or companies.  Most of the people making the tools used for this technique were consistent with their numbers. That made me very happy and excited about sharing with you what I’d learned.

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