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Home » Stitches & Techniques

What Are Wraps Per Inch?

Published: Nov 6, 2023 · Modified: Apr 28, 2026 by Harriet · Leave a Comment

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Image with text overlay that says, A crochet guide for yarn weights and wraps per inch.

Just starting out? Our crochet beginner essentials guide covers everything you need to get set up, from tools and yarn to the basic skills you'll use in every project.

Table of contents
  • What Is Wraps Per Inch?
  • What You Will Need
  • How To Measure Wraps Per Inch
  • Related Guides
  • Stay Connected
  • Comments

What Is Wraps Per Inch?

Wraps per inch (WPI) is a measurement used in the fiber arts, particularly in knitting, crocheting, and spinning yarn.

It is a way to determine the thickness or diameter of a yarn or fiber.

WPI is useful when you want to match a yarn weight or the gauge of a pattern or create a consistent fabric in your project.

We use it often to check the yarns we use because you can't always go by what is on the yarn label. After all, different manufacturers use different standards.

What You Will Need

  • A ruler
  • The yarn you want to measure

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How To Measure Wraps Per Inch

Instructions

  • Unwind a few inches of yarn from the skein or ball to make it easier to work with.
  • Hold the ruler vertically in one hand.
  • Then hold the yarn in your other hand, so it is parallel to the ruler.
  • Begin wrapping the yarn or fiber around the ruler for an inch, maintaining a consistent tension, but not too loose or too tight.
  • Wrap the yarn side by side, without any gaps or overlapping.
  • Once you have wrapped the yarn for an inch, count the number of wraps you have made in that inch and use that number to determine the yarn weight from the chart below.
The yarn in this image has 6 wraps per inch which is equal to #6 super bulky yarn.

Wraps Per Inch By Yarn Weight

CYC WeightWPI
#0 Lace30-40+
#1 Super Fine14-30
#2 Fine12-18
#3 Light11-15
#4 Medium9-12
#5 Bulky6-9
#6 Super Bulky5-6
#7 Jumbo1-4
This chart is based on WPI information shared by https://www.craftyarncouncil.com/standards/how-measure-wraps-inch-wpi
Yellow yarn wrapped around ruler.
The above yellow yarn has 21 wraps per inch which falls into the #1 super fine yarn range.

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Related Guides

  • See how projects come together in our guide on how to join granny squares.
  • Learn the most common techniques in our basic crochet stitches guide.
  • Ready to try your first project? Explore our ultimate granny square guide.
  • Understand sizing with our granny square sizes and uses guide.

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