A ruler can tell you something useful about a mystery skein.
WPI means wraps per inch – the number of wraps of yarn that fit side by side within one inch. It offers a practical way to estimate yarn thickness, especially when working with handspun or yarn whose label has wandered off.
To measure, wrap the yarn around a ruler or a smooth straight tool. Let the strands touch without overlapping, stretching them tight, or squashing them together. Count the wraps across one inch.
More wraps generally indicate a finer yarn; fewer wraps indicate a thicker one. Comparing your measurement with a WPI chart helps estimate the yarn’s weight category, such as fingering, sport, DK, worsted or bulky. Charts can differ, so treat the result as a guide. With handspun, check several sections to get a sense of any variation.
WPI is a starting point rather than a promise of how the yarn will knit or crochet. Fiber, texture and construction also affect the finished fabric.
Curator’s Note: WPI measures yarn thickness. Stitch gauge measures your stitches in fabric. Use WPI to help choose a starting point, then make a swatch to see how your yarn behaves.
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