Yarn Wraps Per Inch Calculator

WPI measurement and yarn weight classification.

Wraps per inch (WPI)

Number of plies

Sample weight (oz)

Sample length (yd)

Tab to move between fields

Yarn weight (#)

Yards/lb (McMorran)9,800

Yards/lb (measured)800

English count (Ne)30.15

Tex19.6

Yarn diameter (mm)1.81

Weight CategoryDK

Needle Size US5-7

How to Use This Calculator

Wrap your yarn snugly around a ruler for 1 inch without stretching or overlapping, then count the wraps and enter the WPI.
Enter the number of plies in this yarn.
Weigh a known length of yarn and enter both the weight in ounces and the length in yards for a measured yards-per-pound.
Read the yarn weight number (0 = lace through 6 = super bulky) to identify the standard weight category.
Compare the McMorran yards/lb (from WPI) with the measured yards/lb for a cross-check.
Use the yarn diameter in mm and the Tex/Ne counts if you need to match yarn specs to a weaving sett.

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