Tool 4 of 4 · Sizes

Needles, hooks and yarn weights.

Millimeters beside US sizes, and the yarn weight categories 0 to 7 as the Craft Yarn Council’s table lists them (read October 18, 2026). Your pattern’s gauge always wins over a category’s typical range.

Yarn weight categories

From lace to jumbo.

0 Lace Fingering, 10-count crochet thread 33–40 knit sts / 4 in

1 Super Fine Sock, Fingering, Baby 27–32 knit sts / 4 in

2 Fine Sport, Baby 23–26 knit sts / 4 in

3 Light DK, Light Worsted 21–24 knit sts / 4 in

4 Medium Worsted, Afghan, Aran 16–20 knit sts / 4 in

5 Bulky Chunky, Craft, Rug 12–15 knit sts / 4 in

6 Super Bulky Super Bulky, Roving 7–11 knit sts / 4 in

7 Jumbo Jumbo, Roving 6 and fewer knit sts / 4 in

On a phone, slide the table sideways to see every column.

Typical ranges per category. Knit gauge in stockinette, crochet gauge in single crochet, both over 4 inches.
Category	Knit gauge	Needle	Crochet gauge	Hook
0 Lace	33–40 sts	1.5–2.25 mm US 000–1	32–42 double crochets	Steel 1.6–1.4 mm; regular hook 2.25 mm US Steel 6, 7, 8; regular hook B-1
1 Super Fine	27–32 sts	2.25–3.25 mm US 1 to 3	21–32 sts	2.25–3.5 mm US B-1 to E-4
2 Fine	23–26 sts	3.25–3.75 mm US 3 to 5	16–20 sts	3.5–4.5 mm US E-4 to 7
3 Light	21–24 sts	3.75–4.5 mm US 5 to 7	12–17 sts	4.5–5.5 mm US 7 to I-9
4 Medium	16–20 sts	4.5–5.5 mm US 7 to 9	11–14 sts	5.5–6.5 mm US I-9 to K-10½
5 Bulky	12–15 sts	5.5–8 mm US 9 to 11	8–11 sts	6.5–9 mm US K-10½ to M-13
6 Super Bulky	7–11 sts	8–12.75 mm US 11 to 17	7–9 sts	9–15 mm US M-13 to Q
7 Jumbo	6 sts and fewer	12.75 mm and larger US 17 and larger	6 sts and fewer	15 mm and larger US Q and larger

Source: Craft Yarn Council standards, read October 18, 2026. Standard Yarn Weight System. Steel crochet hooks are numbered the other way round: the higher the number, the smaller the hook. The Council’s page also says its updated system now includes a Size 8; its table did not show one yet when we read it, so Rowsmith lists 0 to 7.

Knitting needles

Millimeters	US size
1.50 mm	000
1.75 mm	00
2 mm	0
2.25 mm	1
2.75 mm	2
3 mm	no US size
3.125 mm	3
3.25 mm	3
3.50 mm	4
3.75 mm	5
4 mm	6
4.25 mm	6
4.50 mm	7
5 mm	8
5.25 mm	9
5.50 mm	9
5.75 mm	10
6 mm	10
6.50 mm	10½
7 mm	no US size
8 mm	11
9 mm	13
10 mm	15
12.50 mm	17
12.75 mm	17
15 mm	19
19 mm	35
25 mm	50
35 mm	70

Crochet hooks

Millimeters	US size
2.25 mm	B-1
2.50 mm	no US size
2.75 mm	C-2
3.125 mm	D
3.25 mm	D-3
3.50 mm	E-4
3.75 mm	F-5
4 mm	G-6
4.25 mm	G
4.50 mm	7
5 mm	H-8
5.25 mm	I
5.50 mm	I-9
5.75 mm	J
6 mm	J-10
6.50 mm	K-10½
7 mm	no US size
8 mm	L-11
9 mm	M/N-13
10 mm	N/P-15
11.50 mm	P-16
12 mm	no US size
15 mm	P/Q
15.75 mm	Q
16 mm	Q
19 mm	S
25 mm	T/U/X
30 mm	T/X

Source: Craft Yarn Council standards, read October 18, 2026. Hooks and needles. Where one US size covers two millimeter sizes, both are listed, as the Council lists them. Makers’ own labels can differ: the millimeter size printed on the needle or hook is the one to trust.

Needles, hooks and yarn weights.

Which weight is my gauge?

From lace to jumbo.

Knitting needles

Crochet hooks