
Table of contents
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.

Wraps Per Inch By Yarn Weight
| CYC Weight | WPI |
| #0 Lace | 30-40+ |
| #1 Super Fine | 14-30 |
| #2 Fine | 12-18 |
| #3 Light | 11-15 |
| #4 Medium | 9-12 |
| #5 Bulky | 6-9 |
| #6 Super Bulky | 5-6 |
| #7 Jumbo | 1-4 |

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Learn To Crochet
If you are new to crochet and would like to learn more. You might like these:
- Basic crochet stitches for beginners
- How to crochet for beginners
- Crochet terms and abbreviations
- How to read a crochet pattern for beginners
- How to read a yarn label
- How to hold yarn when crocheting
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