WPI

Wraps per inch

A way of measuring the thickness of your yarn. To measure WPI, wrap the yarn around a ruler until the wraps cover one inch of the ruler. Count how many wraps fit into one inch.

Yarn weight as measured by WPI

Yarn WeightWPI
Lace30-40+
Super Fine14-30
Fine12-18
Light11-15
Medium9-12
Bulky6-9
Super-Bulky5-6
Jumbo1-4

More information:

Scroll to Top