Standard Yarn Weight System

Yarn Weight Symbol & Category Names Type of Yarns in Category Crochet Gauge* Ranges in sc to 4 inch Recommended Hook in Metric Size Range Recommended Hook in US Size Range
Fingering 10-count crochet thread 32-42 dc sts** Steel*** 1.6-1.4 mm Steel*** 6,7,8
Regular hook B/1
Sock, Fingering, Baby 21-32 sts 2.25-3.5 mm B/1 to E/4
Sport, Baby 16-20 sts 3.5-4.5 mm E/4 to 7
DK, Light Worsted 12-17 sts 4.5-5.5 mm 7 to I/9
Worsted, Afghan, Aran 11-14 sts 5.5-6.5 mm I/9 to K/10½
Chunky, Craft, Rug 8-11 sts 6.5-9 mm K/10½ to M/13
Bulky, Roving 5-9 sts  9 mm and larger  M/13 and larger

* GUIDELINES ONLY: The above reflect the most commonly used gauges and hook sizes for specific yarn categories.
** Lace weight yarns are usually knitted or crocheted on larger hooks to create lacy, openwork patterns. Accordingly, a gauge range is difficult to determine. Always follow the gauge stated in your pattern.
*** Steel crochet hooks are sized differently from regular hooks—the higher the number, the smaller the hook, which is the reverse of regular hook sizing.

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