Aran Worsted Weight Yarns knit up at 16-20 stitches per 4 inches in stockinette stitch. They crochet at 11-14 stitches per 4 inches in single crochet

Baby Weight Yarns knit up at 23-26 stitches per 4 inches in stockinette stitch. They crochet at 16-20 stitches per 4 inches in single crochet

Bulky Weight Yarns knit up at 12-15 stitches per 4 inches in stockinette stitch. They crochet at 8-11 stitches per 4 inches in single crochet

Crochet Threads come in various sizes and fibers. Thread sizes range from 100(finest) up to 16 - 12 - 10 - 8 - 5 and 3 at size 0 or 1 threads are then classified as "Yarns". The most commonly used crochet thread is #10 also known as "breadspread weight" crochet thread

DK Weight Yarns knit up at 21-24 stitches per 4 inches in stockinette stitch. They crochet at 12-17 stitches per 4 inches in single crochet

Fingering Weight Yarns knit up at 27-32 stitches per 4 inches in stockinette stitch. They crochet at 21-32 stitches per 4 inches in single crochet

Light Worsted Weight Yarns knit up at 21-24 stitches per 4 inches in stockinette stitch. They crochet at 12-17 stitches per 4 inches in single crochet

Sport Weight Yarns knit up at 23-26 stitches per 4 inches in stockinette stitch. They crochet at 16-20 stitches per 4 inches in single crochet

Super Bulky Weight Yarns knit up at 6-11 stitches per 4 inches in stockinette stitch. They crochet at 5-9 stitches per 4 inches in single crochet

Some yarns vary their stitch gauge depending on tension and needle size. Super elastic or stretchy yarns knit or crochet to various gauges.

Worsted Weight Yarns knit up at 16-20 stitches per 4 inches in stockinette stitch. They crochet at 11-14 stitches per 4 inches in single crochet