For Canadians and Americans, the crochet hook sizes are represented by letters and numbers, depending on the country.
Sometimes, the hooks are not labelled with the proper identification that a person in Canada or the United States may recognize.
The chart provided answers to the following three questions?
- What are the millimetre sizes for crochet hooks?
- What are the US sizes for hooks with millimetres?
- What are the conversions for crochet hooks for Canadians and Americans?
We have the answers to these frequent questions.
You can print this table to keep it on file in your crochet storage.
| Metric Sizes in MM | US Sizes | European |
| 2.0 | n/a | 14 |
| 2.25 | B/1 | 13 |
| 2.5 | n/a | 12 |
| 2.75 | C/2 | n/a |
| 3.0 | n/a | 11 |
| 3.25 | D/3 | 10 |
| 3.5 | E/4 | 9 |
| 3.75 | F/5 | n/a |
| 4.0 | G/6 | 8 |
| 4.5 | 7 | 7 |
| 5.0 | H/8 | 6 |
| 5.5 | I/9 | 5 |
| 6.0 | J/10 | 4 |
| 6.5 | K/10 | 3 |
| 7.0 | n/a | 2 |
| 8.0 | L/11 | |
| 9.0 | M/13 | |
| 10.0 | N/15 | |
| 11.5 | P/16 | |
| 16 | Q | |
| 19 | S | |
Allen says
Thanks for this! My confusion is with both letter AND number US sizing. I thought the number was European … but based on your chart that’s not the case.