Crochet Hook Size Guide
Not sure which hook to reach for? Here's a quick US-to-metric conversion chart, plus notes on which sizes come up most in our patterns.
| US Size | Metric (mm) | Common Uses |
|---|---|---|
| B-1 | 2.25 mm | Amigurumi, keychains, fine detail work |
| C-2 | 2.75 mm | Amigurumi, small toys |
| D-3 | 3.25 mm | Amigurumi, light worsted projects |
| E-4 | 3.5 mm | Amigurumi, garments |
| F-5 | 3.75 mm | Baby items, garments |
| G-6 | 4 mm | Most worsted-weight patterns |
| H-8 | 5 mm | Blankets, scarves, worsted/aran weight |
| I-9 | 5.5 mm | Blankets, chunky accessories |
| J-10 | 6 mm | Bulky yarn projects |
Each pattern lists the recommended hook size and yarn weight, but gauge can vary from crocheter to crocheter — always crochet a small swatch first if size matters for your project.