Hook size conversion chart
3.5 mm = US Size E/4
Best for fine detail & lightweight projects.
Common uses include lace edging, doilies, thread crochet, lightweight shawls, amigurumi with fine lace, and decorative trims.
Why choose this size? Creates tight, defined stitches with excellent control.
4.0 mm = US G/6
Best for DK & light worsted yarns.
Common uses include lightweight scarves, baby garments, hats with soft drape, granny squares (lightweight versions), and market bags.
Why choose this size? Balanced between detail and speed. Great for wearables.
4.5 mm = US Size 7
Best for worsted yarn with extra drape.
Common uses include garments with movement, soft blankets, textured stitch patterns, and beginner projects that shouldn't feel stiff.
Why choose this this size? Adds flexibility and reduces hand strain for tight crocheters.
5.0 mm = US Size H/8 MOST POPULAR
Best for standard worsted-weight yarn.
Common uses include scarves, hats, Afghans & blankets, dishcloths, beginner projects, gifts & sampler projects.
Why choose this size? The universal workhorse-excellent stitch definition with comfortable tension.
5.5 mm = US Size I/9
Best for worsted to bulky transitions.
Common uses include cozy scarves, looser garments, shawls, temperature blankets, and faster projects.
Why choose this size? Perfect for relaxed tension and soft, drapey fabric.
6.0 mm = US Size J/10
Best for bulky yarns
Common uses include chunky blankets, beanies, cowls, home decor (pillows, throws), and fast gift projects.
Why choose this size? Creates bold stitches with fewer hand movements-great for comfort.
6.5 mm - 7.0 mm = US Size K/10.5
Best for super bulky yarns.
Common uses include oversized scarves, quick blankets, rugs, basket-style projects, armchair-friendly crochet.
Why choose this size? Maximum speed with minimal strain.
8.0 mm = US Size L/11
Best for very bulky yarn & statement pieces.
Common uses include statement blankets, oversized shawls, wall hangings, and decorative throws.
Why choose this size? Big, beautiful stitches that show off texture and yarn.
Not sure what size to choose?
Beginner or general use - Go with 5.0 mm / H/8
Comfort & relaxed stitching - Go with 5.5 mm - 6.0 mm / I/9 - J/10
Fast, cozy projects - Go with 6.5 mm - 7.0 mm / K/10.5
Many crocheters benefit from sizing up 0.5 - 1.0 mm when using ergonomic wooden hooks to reduce hand tension while maintaining stitch consistency.