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WPI Yarn Weight Gauge

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Measure the thickness of any yarn: Lay yarn into the grooves or wrap it into the inch-wide notch and compare the number of times your yarn fits in the slot with the key. 

These lightweight, 2.5" square tools are compact and handy to have along, whether you tuck them inside your knitting bag or hang them from the ball chain loop outside for easy access.

Product Details:

  • Material: Domestic Cherry

  • Approximate Size: 2.5” x 2.5” x 3/16”


Made from locally sourced cherry hardwood, handmade and finished in the Katrinkles studio in Providence, RI.

Customer Reviews

Based on 3 reviews
Mysteries Resolved

So very grateful for this little thing! While I've tried to keep yarns by weight together, ummmm, sometimes they just get jumbled up. It really does work! Thank you <3 <3 <3

Love it

I am a new knitter so can't always tell the weight by looking. It worked perfectly. I bought one for a friend for Christmas. We were talking and she commented she had lots of yarn she didn't know the weight of, so hers was in the mail the next day. Not waiting for Christmas.


I still have to come in and pick this up. Yikes!

Your yarn makes a positive impact

By purchasing yarn from String Theory, you’re lifting up a number of small and female-owned businesses. We help women in Rwanda, who survived the genocide, educate a new generation. We help women in Uruguay find meaningful work without leaving their rural homes. We help a family in New Hampshire maintain a mill, a tradition spanning hundreds of years. We help restore the Patagonia Grasslands by encouraging sustainable farming.Every yarn we stock makes a positive impact.

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