The Craft Yarn Council creates and sets yarn standard on commonly used gauges and needle/hook sizes. Now you can easily find the right yarn size for your project based on gauge.

This helpful chart also allows you to compare different yarns weights. Just because a pattern states what yarn it used, doesn't mean you have to choose that yarn.

You can interchange yarns within the weight. Be sure to purchase enough yarn to complete your project.

Please note these are guidelines only - many yarns may be knitted/crocheted at a tighter or looser gauge depending on the project you'd like to create.

You can find more yarn industry standards at the Craft Yarn Council (source).

Yarn Weight Types of Yarn Knit Gauge/Needle Size Crochet Gauge Hook Size
#0 Lace Weight 33-40 sts to 4" on US 000-1 needles 32-42 sts to 4" on 6-8 steel or B-1 hook
#1 Sock, Fingering 27-32 sts to 4" on US 1-3 needles 21-32 sts to 4" on US B-1 to E-4 hooks
#2 Sport, Baby Weight 23-26 sts to 4" on US 3-5 needles 16-20 sts to 4" on US E-4 to 7 hooks
#3 DK, Light Worsted Weight 21-24 sts to 4" on US 5-7 needles 12-17 sts to 4" on US 7 to I-9 hooks
#4 Worsted, Aran Weight 16-20 sts to 4" on US 7-9 needles 11-14 sts to 4" on US I-9 to K-10.5 hooks
#5 Chunky, Bulky Weight 12-15 sts to 4" on US 9-11 needles 8-11 sts to 4" on US K-10.5 to M-13 hooks
#6 Bulky, Roving Weight 7-11 sts to 4" on US 11-17 needles 7-9 sts to 4" on US M-13 to Q hooks
#7 Jumbo, Roving Weight 6 sts or less to 4" on US 17-50 needles 6 sts or less to 4" on US Q and larger hooks