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Crochet Hook Sizes Explained | Complete Chart (mm to US)
Crochet hooks come in metric (mm) and US letter/number sizes, and picking the right one changes how your project looks. Here’s a complete crochet hook sizes chart plus which size to use for amigurumi.
Crochet hook size chart (mm to US)
| Metric (mm) | US size | Best for |
|---|---|---|
| 2.25 mm | B-1 | Fine thread, tiny amigurumi |
| 2.75 mm | C-2 | Amigurumi (tight stitches) |
| 3.25 mm | D-3 | Amigurumi, small toys |
| 3.5 mm | E-4 | Beginner amigurumi |
| 4.0 mm | G-6 | Worsted yarn, general use |
| 5.0 mm | H-8 | Blankets, scarves |
| 6.0 mm | J-10 | Chunky projects |
Which hook size for amigurumi?
For amigurumi you go one or two sizes smaller than your yarn label recommends. Tighter stitches mean no gaps and no stuffing peeking through. With standard worsted yarn, a 3.0-3.5 mm hook is the sweet spot for beginners.
Match your hook to your yarn
Thicker yarn needs a bigger hook; thinner yarn a smaller one. See our best yarn for amigurumi guide to pair them correctly, and our best crochet hooks picks.
Not sure? Start with a kit
Our beginner crochet kits come with the correct hook already matched to the yarn and no-sew pattern – so you can skip the math and start with the magic ring today.
Now that you know exactly which hook size to grab… Try a reversible pattern with your hook 🧶
Our signature Poké Ball patterns flip inside-out into the character — two toys in one, no sewing. Beginners finish them every day.
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