WPI (Wraps Per Inch)
Definition
A way to estimate yarn weight by counting how many times it wraps around a ruler per inch. Always confirm whether a pattern uses UK or US terminology before starting. Swatch to verify gauge, then adjust hook size or tension to achieve the desired fabric and fit.
Examples
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Higher WPI = finer yarn.
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Useful when labels are missing.
Related Terms
Yarn Weight System
Classifies yarn thickness. UK often uses ply names; US uses numbers from 0 (lace) to 7 (jumbo). Always confirm whether a pattern uses UK or US terminology before starting. Swatch to verify gauge, then adjust hook size or tension to achieve the desired fabric and fit.
Gauge / Tension
The number of stitches and rows per measured area. Critical for sizing. Always confirm whether a pattern uses UK or US terminology before starting. Swatch to verify gauge, then adjust hook size or tension to achieve the desired fabric and fit.