Crochet hook sizes matter. New crocheters may not notice a difference until they stare at a yarn aisle and see all the different sizes.
I recommend hook sizes 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 is H, I, J, and K. Be careful with the Boye brand of hooks. See note below in the list.
If you are unsure, look at the ball band, which recommends the hook size needed.
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Sizes are 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
- Careful Boye Hooks have 5.25 mm and are indicated as I/9 size. It’s not a standard size. Check the millimetres on the hook if required.
- 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 recommend the hook sizes in red for learning.
How to Check Gauge
Summary
Article Name
Complete List of Crochet Hook Sizes + Conversions with Free Downloadable
DescriptionSee the different size crochet hooks and what the equivalent is when converting from metric to USA sizing.
Author Michael Sellick
Publisher Name
The Crochet Crowd
Publisher Logo
Diane S says
I didn't know Boye was different and they are my favorite hooks. I'll need to do some swatches with other hooks to compare. Thank you!
Dbjbcjd says
They are my fav too. I only use them and have for the past 50 yrs.
Karen says
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.
Val says
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.
Christine says
What about size M? I have a pattern calling for size M or 13mm
Victoria Nitzsche says
Size M is 9.0 needle and size 13 is 0.85 needle
Jean M says
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.