So what’s up with all these different ways of writing hook sizes? Most patterns use metric, US or UK/Canadian way of describing hooks, but I also have some Japanese hooks I never knew the size of. That’s why I made conversion tables showing the different hook sizes and their conversions.
This blog uses the metric way of describing hook sizes, but often I’ll also give you the US/UK sizes.
Normal hooks
95% of the time, I use hooks size 2mm to 4mm, so I’ll just start with those!
| Crochet Hook Size Conversion Table | |||
|---|---|---|---|
| Metric (mm) | US | UK/CA | Japan |
| 2 | 14 | 2/0 | |
| 2.25 | B/1 | 13 | 3/0 |
| 2.5 | 12 | 4/0 | |
| 2.75 | C/2 | ||
| 3 | 11 | 5/0 | |
| 3.25 | D/3 | 10 | |
| 3.5 | E/4 | 9 | 6/0 |
| 3.75 | F/5 | ||
| 4 | G/6 | 8 | 7/0 |
Thread hooks
Since I like doing mirco-crochet, I made the same table for thread crochet hooks (also called steel hooks). Weirdly enough, an US hook 1 can be either 2.25mm (‘normal’ hooks) or 2mm (steel/thread hooks). The same goes with UK hooks: a size 3 hook can be 6,5mm (‘normal’ hooks) or 1,25mm (steel/thread hooks).
| Crochet Hook Size Conversion Table | |||
|---|---|---|---|
| Metric (mm) | US (steel) | UK/CA | Japan |
| .6 | 14 | 6 | 10 |
| .7 | 12 | 5 | 6 |
| .8 | 11 | ||
| .9 | |||
| 1 | 10 | 4 | 4 |
| 1.25 | 8 | 3 | |
| 1.5 | 7 | 2.5 | |
| 1.75 | 4 | 2 | |
| 2 | 1 | 1 | 7/0 |
Wow. Not like it’s complicated or anything…
Thanks for a very useful PDF! 😉