The standard crochet hook size for worsted weight yarn is 5.0mm to 5.5mm, a US H-8 to I-9. I recommend an H-8 as the safest first hook, since it’s the size most beginner patterns default to.
H-8 versus I-9 for worsted weight
An H-8 gives a slightly tighter, more structured fabric, which suits amigurumi and stuffed items. An I-9 opens the fabric up a touch, better for garments and blankets that need to drape.
When to step outside this range
Size down to a G-6 for amigurumi that needs to hide stuffing completely, and size up to a J-10 for a softer, more relaxed blanket.
Frequently asked questions
Is H-8 the best hook for worsted weight yarn?
It’s the most common default, and I recommend it as a starting point, though I-9 is just as standard for a slightly looser fabric.
What if my worsted weight project comes out too small?
Your tension likely runs tight. Try a hook a half size larger and swatch again before continuing the full project.
See every yarn weight and hook size pairing
Get the full breakdown from lace to super bulky.