Vintage crochet and knitting patterns often have hooks and knitting needles sized differently than modern patterns. I have charts of their metric and imperial equivalents.
Crochet Hook & Knitting Needle Sizes
Vintage crochet and knitting patterns often have hooks and knitting needles sized differently than modern patterns. I have charts of their metric and imperial equivalents.
| Crochet Hooks | US–Imperial | UK-Canada-AUS |
| 2 mm | – | 14 |
| 2.25 mm | B-1 | 13 |
| 2.50 mm | – | 12 |
| 2.75 mm | C-2 | 11 |
| 3.25 mm | D-3 | 10 |
| 3.5 mm | E-4 | 9 |
| 3.75 mm | F-5 | – |
| 4 mm | G-6 | 8 |
| 5 mm | H-8 | 6 |
| 5.5 mm | I-9 | 5 |
| 6 mm | J-10 | 4 |
| 6.5 mm | K-10 1/2 | 3 |
| 8 mm | L-11 | 0 |
| 9 mm | M-13 | 00 |
| 10 mm | N-15 | 000 |
| 15 mm | Q | – |
| Knitting Needles | US–Imperial | UK-Canada |
| 2.25 mm | 1 | 13 |
| 2.75 mm | 2 | 12 |
| 3 mm | 2.5 | 11 |
| 3.25 mm | 3 | 10 |
| 3.5 mm | 4 | – |
| 3.75 mm | 5 | 9 |
| 4 mm | 6 | 8 |
| 4.5 mm | 7 | 7 |
| 5 mm | 8 | 6 |
| 5.5 mm | 9 | 5 |
| 6 mm | 10 | 4 |
| 6.5 mm | 10.5 | 3 |
| 7 mm | – | 2 |
| 8 mm | 11 | 0 |
| 9 mm | 13 | 00 |
| 10 mm | 15 | 000 |