Wraps per inch or WPI is a key measurement in handspinning but can also be used to determine the weight of yarn for knitting, crochet and weaving. This video is a bit of a deep-dive, showing two methods and discussing what you can do with wraps per inch once you've measured your yarn.
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Featured tools (none of these were sponsored or gifted and I don't receive commission from any of these links):
YARN GAUGES
Ashford Yarn Gauge:
https://www.ashford.co.nz/other-acces...
Laceweight gauge by Laserbyj: https://www.etsy.com/uk/listing/14497...
Spinner's Control Card by VIP Fibers. No longer available but this one from HipStrings is very similar:
https://hipstrings.com/products/preci...
or the Daedalus version:
https://shop.daedalusspinningwheels.c...
Spin Buddy by Lumigrafika:
https://lumigrafika.square.site/produ...
WPI Yarn Measuring Tool by Hilltop Cloud:
https://hilltopcloudshop.co.uk/collec...
Grey on Black Spinning WPI Card by Succaplokki:
https://www.etsy.com/uk/listing/26353...
SINGLES TO 2-PLY WPI REFERENCES
Spinning Wool: Beyond the Basics, Anne Field, ISBN 978-1408130810 (out of print at the time I published this video)
The Essentials of Handspinning, Mabel Ross, ISBN 978-0950729206 (also out of print)
Abby's blog post: http:// abbysyarns.com/2008/12/singles- two-ply-three-ply-and-wraps-per-inch