Yarn Weight Converter
Convert yarn sizes across WPI (Wraps Per Inch), ply, and standard Craft Yarn Council weight categories.
WPI (Wraps Per Inch) Test: Wind your yarn around a standard ruler or needle gauge for 1 inch. Count the individual strands. Do not wrap too tight (compresses yarn) or too loose (leaves gaps) to obtain an accurate yardage measurement.
Category 4: Medium
Worsted, Afghan, Aran
9-11 wraps
16-20 sts
11-14 double crochet
4.5 - 5.5 mm (US 7 to 9)
5.5 - 6.5 mm (US I-9 to K-10.5)
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