Hook & Needle Conversion Chart (Japanese, US & Metric)

I found these  Conversion Chart after starting with the Tunisian Crochet Hooks. I bought a set in mm sizes and I thought it would be useful to keep a copy of the conversions handy!

Knitting Needle and Tunisian Crochet Hook Sizes – Standard

JPN needle size (号)			US needle equivalent
0	2.1 mm		0	2.0 mm
1	2.4 mm		1½	2.5 mm
2	2.7 mm		2	2.75 mm
3	3.0 mm		2½	3.0 mm
4	3.3 mm		3	3.25 mm
5	3.6 mm		4 or 5	3.5 or 3.75 mm
6	3.9 mm		6	4.0 mm
7	4.2 mm		6 or 7	4.0 or 4.5 mm
8	4.5 mm		7	4.5 mm
9	4.8 mm		7 or 8	4.5 or 5.0 mm
10	5.1 mm		8	5.0 mm
11	5.4 mm		9	5.5 mm
12	5.7 mm		9 or 10	5.5 or 6.0 mm
13	6.0 mm		10	6.0 mm
14	6.3 mm		10 or 10½	6.0 or 6.5 mm
15	6.6 mm		10½	6.5 mm

Knitting Needle Sizes – Jumbo

JPN needle size (ミリ)			US needle equivalent
7	7 mm		10½	6.5 mm
8	8 mm		11	8 mm
9	9 mm		13	9 mm
10	10 mm		15	10 mm
12	12 mm		17	12.75 mm
15	15 mm		19	15 mm
20	20 mm		35	19 mm
25	25 mm		50	25 mm
30	30 mm		–

Crochet Hook Sizes – Standard

JPN standard hook size (号)			US standard hook equivalent
2/0	2.0 mm		A-0 (or 4 steel)	2.0 mm
3/0	2.3 mm		B-1 (or 2 steel)	2.25 mm
4/0	2.5 mm		B-1 or C-2	2.25 or 2.75 mm
5/0	3.0 mm		C-2 or D-3	2.75 or 3.25 mm
6/0	3.5 mm		E-4 (or 00 steel)	3.5 mm
7/0	4.0 mm		G-6	4.0 mm
7.5/0	4.5 mm		–
8/0	5.0 mm		H-8	5.0 mm
10/0	6.0 mm		J-10	6.0 mm

Crochet Hook Sizes – Jumbo

JPN jumbo hook size (ミリ)			US standard hook equivalent
7	7 mm		K-10½	6.50 mm
8	8 mm		L-11	8.00 mm
9	9 mm		M/N-13	9.00 mm
10	10 mm		N/P-15	10.00 mm
15	15 mm		P/Q or Q	15 or 16 mm
20	20 mm		S	19 mm

Crochet Hook Sizes – Lace and Steel

JPN lace hook size (号)			US steel hook equivalent
0	1.75 mm		6	1.80 mm
2	1.50 mm		8	1.50 mm
4	1.25 mm		10	1.30 mm
6	1.00 mm		12	1.00 mm
8	0.90 mm		13	0.85 mm
10	0.75 mm		14	0.75 mm
12	0.60 mm		–
14	0.50 mm		–