Crochet hook sizes determine the size of the loops you create when crocheting. Larger hooks produce larger stitches and looser fabric, while smaller hooks create tighter stitches.
Hook sizes are labeled using different systems, including metric millimeters (mm), US letter sizes, and UK numbering.
How Crochet Hook Sizes Are Labeled
- Metric (mm) — The most consistent system. The number refers to the diameter of the hook shaft in millimeters.
- US Sizes — Often shown as letters or numbers such as H-8, I-9, or J-10.
- UK Sizes — A numbering system that typically decreases as hook size increases.
Crochet Hook Size Conversion Chart
| Metric (mm) | US Size | UK Size | Common Use |
|---|---|---|---|
| 2.0 mm | B-1 | 14 | Fine yarn, thread crochet |
| 2.25 mm | B-1 | 13 | Lightweight yarn |
| 2.75 mm | C-2 | 12 | Light yarn projects |
| 3.25 mm | D-3 | 10 | Sport weight yarn |
| 3.5 mm | E-4 | 9 | Lightweight garments |
| 3.75 mm | F-5 | – | Light yarn projects |
| 4.0 mm | G-6 | 8 | DK yarn |
| 4.5 mm | 7 | 7 | DK / light worsted |
| 5.0 mm | H-8 | 6 | Worsted yarn |
| 5.5 mm | I-9 | 5 | Worsted yarn |
| 6.0 mm | J-10 | 4 | Worsted / aran yarn |
| 6.5 mm | K-10.5 | 3 | Bulky yarn |
| 8.0 mm | L-11 | 0 | Bulky yarn |
| 10.0 mm | N-15 | – | Super bulky yarn |
💡 Tip
Patterns often suggest a hook size, but the correct size may vary depending on your yarn and personal tension. Adjust your hook size if stitches feel too tight or too loose.
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