YarnSpace
Knitting needle and crochet hook size chart
Patterns give needle sizes in millimeters, US numbers or old UK numbers, depending on where they were written. This chart converts between them. The millimeter size is the only exact one, so it's the one to go by.
| Metric | US needle | UK (old) | US crochet hook |
|---|---|---|---|
| 2.0 mm | 0 | 14 | – |
| 2.25 mm | 1 | 13 | B-1 |
| 2.5 mm | 1½ | – | – |
| 2.75 mm | 2 | 12 | C-2 |
| 3.0 mm | – | 11 | – |
| 3.25 mm | 3 | 10 | D-3 |
| 3.5 mm | 4 | – | E-4 |
| 3.75 mm | 5 | 9 | F-5 |
| 4.0 mm | 6 | 8 | G-6 |
| 4.5 mm | 7 | 7 | 7 |
| 5.0 mm | 8 | 6 | H-8 |
| 5.5 mm | 9 | 5 | I-9 |
| 6.0 mm | 10 | 4 | J-10 |
| 6.5 mm | 10½ | 3 | K-10½ |
| 7.0 mm | – | 2 | – |
| 8.0 mm | 11 | 0 | L-11 |
| 9.0 mm | 13 | 00 | M/N-13 |
| 10.0 mm | 15 | 000 | N/P-15 |
| 12.0 mm | 17 | – | – |
A dash means there's no common size for it in that system. Different manufacturers occasionally label a size differently, especially between 3 and 3.5 mm, so if a pattern gives millimeters, use those.
Things to know
- US and UK numbers run in opposite directions. US numbers grow with the needle; old UK numbers shrink as the needle gets thicker (UK 14 is a thin 2 mm, UK 000 a thick 10 mm).
- US crochet hooks use a letter and a number (G-6 = 4 mm), and the number doesn't always match the US knitting needle number for the same size.
- The size in a pattern is a starting point. What counts is matching the gauge; change needle size until your swatch matches.
- Steel crochet hooks for fine thread use their own numbering, where higher numbers are thinner.
Always at hand in YarnSpace
YarnSpace has this chart built in, along with yarn weights, common abbreviations and US/UK crochet terms, so you can look things up right next to your project, even offline.
Needle sizes, yarn weights and abbreviations in your pocket
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