Knitting needles are available in metric, British, Canadian and American sizing systems.
| Metric | Canada/UK | USA |
|---|---|---|
| 2 | 14 | 0 |
| 2.5 | 13 | 1 |
| 2.75 | 12 | 2 |
| 3 | 11 | - |
| 3.25 | 10 | 3 |
| 3.5 | - | 4 |
| 3.75 | 9 | 5 |
| 4 | 8 | 6 |
| 4.5 | 7 | 7 |
| 5 | 6 | 8 |
| 5.5 | 5 | 9 |
| 6 | 4 | 10 |
| 6.5 | 3 | 10.5 |
| 7 | 2 | - |
| 7.5 | 1 | - |
| 8 | 0 | 11 |
| 9 | 00 | 13 |
| 10 | 000 | 15 |
