UK to Metric (mm) hook sizes
UK crochet hook sizes converted to Metric (mm), with a link to the full detail page for every size.
| UK | Metric (mm) | Detail |
|---|---|---|
| 14 | 2 mm | 2 mm |
| 13 | 2.25 mm | 2.25 mm |
| 12 | 2.5 mm | 2.5 mm |
| 11 | 3 mm | 3 mm |
| 10 | 3.25 mm | 3.25 mm |
| 9 | 3.5 mm | 3.5 mm |
| 8 | 4 mm | 4 mm |
| 7 | 4.5 mm | 4.5 mm |
| 6 | 5 mm | 5 mm |
| 5 | 5.5 mm | 5.5 mm |
| 4 | 6 mm | 6 mm |
| 3 | 6.5 mm | 6.5 mm |
| 2 | 7 mm | 7 mm |
| 0 | 8 mm | 8 mm |
| 00 | 9 mm | 9 mm |
| 000 | 10 mm | 10 mm |
Other hook charts
Last updated 2026-08-30.