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This needle size conversion chart includes US and UK needle sizes. If you worry about forgetting, you can bookmark the page (at least I do).
Metric (mm) | US Size | UK Size |
2 |
0 |
14 |
2.25 |
1 |
13 |
2.5 |
1.5 |
– |
2.75 |
2 |
12 |
3 |
2.5 |
11 |
3.25 |
3 |
10 |
3.5 |
4 |
– |
3.75 |
5 |
9 |
4 |
6 |
8 |
4.5 |
7 |
7 |
5 |
8 |
6 |
5.5 |
9 |
5 |
6 |
10 |
4 |
6.5 |
10.5 |
3 |
7 |
– |
2 |
7.5 |
– |
1 |
8 |
11 |
0 |
9 |
13 |
00 |
10 |
15 |
000 |
12-12.75 |
17 |
– |
15-16 |
19 |
– |
19 |
35 |
– |
20 |
36 |
– |
25 |
50 |
– |