Master List of Crochet Hook Sizes

Crochet Hook Sizing
Crochet Hook Size Conversions
Crochet Hook Size Conversions

Master List of Crochet Hook Sizes

Crochet hook sizes matter. New crocheters may not even clue in there is a difference until they are staring at a yarn aisle and seeing all the different sizes.

Hook sizes I recommend when making a purchase for the first time. Look for 5 mm, 5.5 mm, 6 mm or 6.5 mm. For our USA friends, that size H, I, J and K.

If you are ever unsure, look at the ball band and it gives a recommendation for the hook size needed.

Sizes indicated in the following order. Metric, USA, UK

  • 2 mm,  n/a, 14
  • 2.25 mm, B/1, 13
  • 2.50 mm, n/a, 12
  • 2.75 mm, C, 11
  • 3.00 mm, n/a, 11
  • 3.25 mm, D, 10
  • 3.50 mm, E/4, 9
  • 3.75 mm, F, n/a
  • 4.00 mm, 6, 8
  • 4.25 mm, G, n/a
  • 4.50 mm, 7, 7
  • 5.00 mm, H/8, 6
  • 5.50 mm, I/9, 5
  • 6.00 mm, J/10, 4
  • 6.50 mm, K/10.5, 3
  • 7.00 mm, n/a, 2
  • 8.00 mm, L, 0
  • 9.00 mm, M/N/15, 00
  • 10.00 mm, P, 000
  • 16.00 mm, Q, n/a
  • 19.00 mm, S, n/a
  • 25.00 mm, U, n/a
  • 30.00 mm, Z, n/a

For beginners, I would recommend the hook sizes in red for learning.

5 Comments

  1. Karen

    Hi, thank you for sharing your knowledge!! Have you done a percentage analysis yet? Like if using a size 4 yarn and changing hook size minimum to maximum, to see how the size changes. So a 4mm hook gets 2″ X2″ but a 5mm hook gets 2.25 x2.25″ or whatever. I guess stitch used changes size too, so there’s that.

  2. Val

    My Clover Amour hooks have a G on them for the 4mm size. Also the UK has been on metric sizing since they joined the EU.

  3. Christine

    What about size M? I have a pattern calling for size M or 13mm

    • Victoria Nitzsche

      Size M is 9.0 needle and size 13 is 0.85 needle

  4. I have some sizes that aren’t listed. 5.25, 5.75 just to mention a couple as well as some steel hooks that aren’t on any list I’ve seen.

Comments are closed