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Crochet Hook Conversion Charts

Here is a crochet hook conversion chart for Aluminum crochet hooks. As you can see, there is a difference between hooks from the USA, the UK, and Canada. It is also important to realize that their may be a slight difference between hook sizes depending upon the company you are purchasing hooks from.

Metric	USA	UK & Canada
2.0 mm	-	-
2.25 mm	-	14
2.5 mm	1 / B	13
2.75 mm	-	12
3.0 mm	2 / C	11
3.25 mm	3 / D	11
3.5 mm	4 / E	10
3.75 mm	5 / F	9
4.0 mm	-	-
4.25 mm	6 / G	8
4.5 mm	-	-
4.75 mm	7	7
5.0 mm	8 / H	6
5.5 mm	8 / I	5
6.0 mm	10 / J	4
6.5 mm	10 1/2 / K	3
7.0 mm	-	2
8.0 mm	11 / L	0
9.0 mm	13 / M	00
9.5 mm	-
10.0 mm	15 / N	000
11.5 mm	P
12.0 mm	17
15.75 mm	Q

Here is a conversion chart for Steel crochet hooks.

Metric	USA	UK & Canada
3.0 mm	00	-
2.5 mm	0	00
2.0 mm	1	1
1.95 mm	2	-
1.89 mm	3	-
1.75 mm	4	2
1.7 mm	5	-
1.6 mm	6	-
1.5 mm	7	2.5
1.25 mm	8	3
1.15 mm	9	-
1.0 mm	10	4
0.8 mm	11	-
0.75 mm	12	5
0.7 mm	13	-
0.6 mm	14	6