For chunky wool , a good starting crochet hook size is usually 6.5 mm to 9 mm , and some chunky yarns work best at 12 mm or more depending on the label and the fabric you want.

Quick Scoop

If you want a simple rule:

  • 6.5 mm to 7 mm for a tighter, neater fabric.
  • 8 mm to 9 mm for a looser, softer drape.
  • 12 mm+ if the yarn is especially thick or labeled super chunky.

Best starting point

Most chunky yarn guides suggest 7 mm, 8 mm, or 9 mm as the usual range, with the exact choice depending on the yarn brand and your tension. Some makers recommend checking the yarn band first, since not all chunky yarns use the same hook size.

Practical tip

If you are unsure, start with the hook size on the yarn label , then make a small swatch. If the stitches feel too tight, go up a size; if they look too loose, go down a size.

If you want, I can also give you a mini size chart for chunky wool vs super chunky wool.