Knitting Needle Size Conversion Chart for US and Metric sizes.

U.S. SizeMetric Size
02.0 mm
12.25 mm
1.52.5 mm
22.75 mm
2.53.0 mm
32.35 mm
43.5 mm
53.75 mm
64.0 mm
74.5 mm
85.0 mm
95.5 mm
106.0 mm
10 1/26.5 mm
118.0 mm
139.0 mm
1510.0 mm
1712.0 mm
1916.0 mm

Standard Yarn Weight System

Source: Craft Yarn Council’s

Yarn WeightTypes of YarnKnit Gauge/Needle SizeCrochet Gauge Hook Size
Lace Weight YarnLace Weight33-40 sts to 4″ on US 000-1 needles32-42 sts to 4″ on 6-8 steel or B-1 hook
Sock, Fingering27-32 sts to 4″ on US 1-3 needles21-32 sts to 4″ on US B-1 to E-4 hooks
#2Sport, Baby Weight23-26 sts to 4″ on US 3-5 needles16-20 sts to 4″ on US E-4 to 7 hooks
#3DK, Light Worsted Weight21-24 sts to 4″ on US 5-7 needles12-17 sts to 4″ on US 7 to I-9 hooks
#4Worsted, Aran Weight16-20 sts to 4″ on US 7-9 needles11-14 sts to 4″ on US I-9 to K-10.5 hooks
#5Chunky, Bulky Weight12-15 sts to 4″ on US 9-11 needles8-11 sts to 4″ on US K-10.5 to M-13 hooks
#6Bulky, Roving Weight7-11 sts to 4″ on US 11-17 needles7-9 sts to 4″ on US M-13 to Q hooks
#7Jumbo, Roving Weight6 sts or less to 4″ on US 17-50 needles6 sts or less to 4″ on US Q and larger hooks

Purchasing Needles

I am lucky to live close to Green Mountain Spinnery, Harrisville Designs, and WEBS for a great selection of knitting needles.

My favorite place to buy online needles is Jimmy Beans Wool. They offer many varieties of knitting needles with fast shipping and excellent service. They also have an Advanced Needles Search to find the perfect needle for your project!