Crochet Hook Sizes

Crochet Hook Conversion Chart
Metric	USA	UK
2.00 mm	-	14
2.25 mm	1 / B	13
2.50 mm	-	12
2.75 mm	C	11
3.00 mm	-	11
3.25 mm	D	10
3.50 mm	4 / E	9
3.75 mm	F	-
4.00 mm	6	8
4.25 mm	G	-
4.50 mm	7	7
5.00 mm	8 / H	6
5.50 mm	9 / I	5
6.00 mm	10 / J	4
6.50 mm	10 1/2 / K	3
7.00 mm	-	2
8.00 mm	-	0
9.00 mm	15 / N	00
10.00 mm	P	000
15.75 mm or 16mm	Q	-

Crochet Hook Set - Steel/Aluminum
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Steel Hook Chart (thread hooks)
Metric	USA	UK
.6 mm	14	6
.75 mm	13	-
.70 mm	12	5
.8 mm	11	-
1 mm	10	4
1.15 mm	9	-
1.25 mm	8	3
1.50 mm	7	2.5
1.6 mm	6	-
1.7 mm	5	-
1.75 mm	4	2
1.85 mm	3	-
1.95 mm	2	-
2 mm	1	1
2.25 mm	0	00
3 mm	00	-

Courtesy: Karp Styles Crochet & Knitting