Crochet Hook Size Converter
US, UK, and metric hook sizes are three independent labeling systems for the same measurement — metric millimeters is the one universal reference. Enter a size in any system to see its equivalents.
or pick a hook size:
- Metric
- 5 mm
- US
- H/8
- UK / Canada
- 6
Full conversion table
| Metric | US | UK / Canada |
|---|---|---|
| 2 mm | — | 14 |
| 2.25 mm | B/1 | 13 |
| 2.75 mm | C/2 | 12 |
| 3.25 mm | D/3 | 10 |
| 3.5 mm | E/4 | 9 |
| 3.75 mm | F/5 | — |
| 4 mm | G/6 | 8 |
| 4.5 mm | 7 | 7 |
| 5 mm | H/8 | 6 |
| 5.5 mm | I/9 | 5 |
| 6 mm | J/10 | 4 |
| 6.5 mm | K/10.5 | 3 |
| 8 mm | L/11 | 0 |
| 9 mm | M/13 | 00 |
| 10 mm | N/15 | 000 |
| 15 mm | P/Q | — |
| 19 mm | S | — |