How to Measure Yarn in WPI (Wraps Per Inch)By Claire Ortega-Reyes – 19 Comments
Yarn weight is an important factor in choosing the right yarn for crochet projects. But have you noticed that the yarns in the same weight category can have varied thicknesses? Some would deviate from the standard weight categories and describe their yarn as ‘light worsted’ or a ‘heavy dk-weight.’ So they started adding gauge information to the descriptions of weight categories, but people still encountered problems. After all, one person’s gauge is never exact; some work tightly and others loosely. And what about the unlabeled yarns we find at markets and sales? How do we know for sure what yarn weight they are?
We simply wrap the yarn around the pencil (or in my case, marker) a few times, until it reaches about an inch in height. Make sure that the yarn is wound not too tightly nor too loosely; just enough so there are no spaces in between yarn winds. Use a flat surface while measuring the wound yarn with your ruler or tape measure. In this example, the yarn is 11 wpi. Checking the table below, my yarn is a DK weight.
|Standard Yarn Weight System||Yarn Type (US)||Ply (UK, NZ, AU)||Wraps Per Inch (WPI)|
|0 or Lace||Thread, Cobweb and Lace||1 – 3 ply||18+ wpi|
|1 or Superfine||Fingering||4 ply||14 wpi|
|2 or Fine||Sport||5 ply||12 wpi|
|3 or Light||DK||8 ply||11 wpi|
|4 or Medium||Worsted||10 ply||9 wpi|
|4 or Medium||Aran||10 ply||8 wpi|
|5 or Bulky||Bulky||12 ply||7 wpi|
|6 or Super Bulky||Super Bulky||5-6 wpi|
I hope this helps! If you have questions or comments, just leave it below I’ll get back to you soon.