Crochet Hook Size Chart
Use this reference chart to convert crochet hook sizes between US, metric (mm), and UK sizing systems.
| US Size | Metric (mm) | UK Size | Common Uses |
|---|---|---|---|
| B-1 | 2.25 mm | 13 | Lace, thread crochet, fine amigurumi |
| C-2 | 2.75 mm | 12 | Fine lace, thread work |
| D-3 | 3.25 mm | 10 | Fingering weight, delicate accessories |
| E-4 | 3.5 mm | 9 | Sport weight, baby items |
| F-5 | 3.75 mm | — | Sport / DK weight, lightweight garments |
| G-6 | 4.0 mm | 8 | DK weight, hats, scarves, amigurumi |
| 7 | 4.5 mm | 7 | DK / worsted weight, dishcloths, bags |
| H-8 | 5.0 mm | 6 | Worsted weight, sweaters, blankets |
| I-9 | 5.5 mm | 5 | Worsted / aran weight, afghans, hats |
| J-10 | 6.0 mm | 4 | Aran / bulky weight, cowls, bags |
| K-10.5 | 6.5 mm | 3 | Bulky weight, chunky scarves, blankets |
| L-11 | 8.0 mm | — | Super bulky, quick blankets, rugs |
| M/N-13 | 9.0 mm | — | Super bulky, thick blankets, baskets |
| N/P-15 | 10.0 mm | — | Jumbo weight, arm crochet, chunky home décor |
| P-16 | 11.5 mm | — | Jumbo weight, wall hangings, rugs |
| Q | 15.0 mm | — | Extreme crochet, jumbo blankets |
| S | 19.0 mm | — | Extreme crochet, jumbo blankets |
Note: UK sizing runs in reverse — larger numbers indicate smaller hooks. Some sizes do not have a direct UK equivalent.
This chart is provided for general reference purposes only. Hook sizing may vary between manufacturers. Always check your yarn label and pattern for the recommended hook size. AvocadoStitches is not responsible for any errors or discrepancies in this chart.