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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 |
– |