Crochet hook sizes
23 crochet hook sizes. Metric, US letter and old UK crochet hook sizes side by side, with the yarn weight each size usually pairs with. Click a name for its full record.
23 of 23 crochet hook sizes
| Size | Metric (mm) | US | UK / Canada | Typical yarn weight |
|---|---|---|---|---|
| 2 mm | 2 | — | 14 | 0 Lace |
| 2.25 mm (US B-1) | 2.25 | B-1 | 13 | 1 Super Fine |
| 2.5 mm | 2.5 | — | — | 1 Super Fine |
| 2.75 mm (US C-2) | 2.75 | C-2 | 12 | 1 Super Fine |
| 3 mm | 3 | — | 11 | 1 Super Fine |
| 3.25 mm (US D-3) | 3.25 | D-3 | 10 | 1 Super Fine |
| 3.5 mm (US E-4) | 3.5 | E-4 | 9 | 1 Super Fine |
| 3.75 mm (US F-5) | 3.75 | F-5 | — | 2 Fine |
| 4 mm (US G-6) | 4 | G-6 | 8 | 2 Fine |
| 4.5 mm (US 7) | 4.5 | 7 | 7 | 2 Fine |
| 5 mm (US H-8) | 5 | H-8 | 6 | 3 Light |
| 5.5 mm (US I-9) | 5.5 | I-9 | 5 | 3 Light |
| 6 mm (US J-10) | 6 | J-10 | 4 | 4 Medium |
| 6.5 mm (US K-10.5) | 6.5 | K-10.5 | 3 | 4 Medium |
| 7 mm | 7 | — | 2 | 5 Bulky |
| 8 mm (US L-11) | 8 | L-11 | 0 | 5 Bulky |
| 9 mm (US M/N-13) | 9 | M/N-13 | 00 | 5 Bulky |
| 10 mm (US N/P-15) | 10 | N/P-15 | 000 | 6 Super Bulky |
| 11.5 mm (US P-16) | 11.5 | P-16 | — | 6 Super Bulky |
| 15 mm (US P/Q) | 15 | P/Q | — | 6 Super Bulky |
| 16 mm (US Q) | 16 | Q | — | 7 Jumbo |
| 19 mm (US S) | 19 | S | — | 7 Jumbo |
| 25 mm (US T/U/X) | 25 | T/U/X | — | 7 Jumbo |
Updated 2 Oct 2026