This crochet hook sizes conversion chart compares metric (mm) measures to US terms.
Please note that this chart does not include steel hooks. They are sized differently. Steel hooks sizing are reversed compared to regular crochet hooks. With steel hooks, the higher the number, the smaller the hook.
Crochet Hook Sizes
| Metric (mm) | US Term |
|---|---|
| 2.25 mm | B-1 |
| 2.5 mm | |
| 2.75 mm | C-2 |
| 3.125 mm | D |
| 3.25 mm | D-3 |
| 3.5 mm | E-4 |
| 3.75 mm | F-5 |
| 4 mm | G-6 |
| 4.25 mm | G |
| 4.5 mm | 7 |
| 5 mm | H-8 |
| 5.25 mm | I |
| 5.5 mm | I-9 |
| 5.75 mm | J |
| 6 mm | J-10 |
| 6.5 mm | K-10.5 |
| 7 mm | |
| 8 mm | L-11 |
| 9 mm | M/N-13 |
| 10 mm | N/P-15 |
| 11.5 mm | P-16 |
| 12 mm | |
| 15 mm | P/Q |
| 15.75 mm | Q |
| 16 mm | Q |
| 19 mm | S |
| 25 mm | T/U/X |
| 30 mm | T/X |
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