This crochet hook sizes conversion chart compares metric (mm) measures to US terms.
Please note that this chart does not include steel hooks. They are sized differently. Steel hooks sizing are reversed compared to regular crochet hooks. With steel hooks, the higher the number, the smaller the hook.
Crochet Hook Sizes
| Metric (mm) | US Term |
|---|---|
| 2.25 mm | B-1 |
| 2.5 mm | |
| 2.75 mm | C-2 |
| 3.125 mm | D |
| 3.25 mm | D-3 |
| 3.5 mm | E-4 |
| 3.75 mm | F-5 |
| 4 mm | G-6 |
| 4.25 mm | G |
| 4.5 mm | 7 |
| 5 mm | H-8 |
| 5.25 mm | I |
| 5.5 mm | I-9 |
| 5.75 mm | J |
| 6 mm | J-10 |
| 6.5 mm | K-10.5 |
| 7 mm | |
| 8 mm | L-11 |
| 9 mm | M/N-13 |
| 10 mm | N/P-15 |
| 11.5 mm | P-16 |
| 12 mm | |
| 15 mm | P/Q |
| 15.75 mm | Q |
| 16 mm | Q |
| 19 mm | S |
| 25 mm | T/U/X |
| 30 mm | T/X |
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Carolyn S Maurer says
Thanks for the neat patterns. My grandmother taught me how to crochet when I was 8. She lived with us and her crochet intrigued me. I am in the process right now teaching a young girl how to crochet. The dish cloths make an easy pattern to start. My first crochet was small doilies which became hats for my dolls. The best memory I have of my grandmother and crochet was when yarn started to be used for crochet. Even though it was the same, because my grandmother crocheted from a picture using the yarn stumped her. It then became my turn to teach her how to crochet with yarn. A memory I treasure.