Yarn Weight (Thickness)
Knitting and crochet yarns come in different weights, or thicknesses. The thickness of your yarn (among other factors) has a huge impact on the look of your knitted or crocheted fabric — and certainly the amount of time it takes to complete it. Yarn weight determines how many stitches it takes to knit 1 inch.
Although there are no official categories for yarn weights, many knitting books and yarn manufacturers use common terms to indicate a yarn’s thickness and the size of the needle with which you work on the yarn.
|Yarn Weight||Number ID and Symbol||US Needle Size||Knitting Stitches Per Inch, in Stockinette Stitch||Common Uses|
|Super fine, fingering, or baby-weight||1–3||7–8||Light layettes, socks|
|Fine or sport-weight||3–6||5–6||Light sweaters, baby things, accessories|
|Light worsted or DK (double-knitting)||5–7||5–5 1/2||Sweaters and other garments, lightweight scarves|
|Medium- or worsted-weight, afghan, Aran||7–9||4–5||Sweaters, blankets, outdoor wear (hats, scarves, mittens, and so on)|
|Bulky or chunky||10–11||3–3 1/2||Rugs, jackets, blankets|
|Super bulky||13–15||2–2 1/2||Heavy blankets and rugs, sweaters|
The thickness of a given yarn is determined by the individual thickness of the plies, not by the number of plies. If the plies are thin, a 4-ply yarn can be finer than a heavy, single-ply yarn.