Knitting needle size chart
US needle numbers and the matching metric size.
| Metric | US size |
|---|---|
| 1.5 mm | 000 |
| 1.75 mm | 00 |
| 2 mm | 0 |
| 2.25 mm | 1 |
| 2.75 mm | 2 |
| 3 mm | – |
| 3.125 mm | 3 |
| 3.25 mm | 3 |
| 3.5 mm | 4 |
| 3.75 mm | 5 |
| 4 mm | 6 |
| 4.25 mm | 6 |
| 4.5 mm | 7 |
| 5 mm | 8 |
| 5.25 mm | 9 |
| 5.5 mm | 9 |
| 5.75 mm | 10 |
| 6 mm | 10 |
| 6.5 mm | 10½ |
| 7 mm | – |
| 8 mm | 11 |
| 9 mm | 13 |
| 10 mm | 15 |
| 12.5 mm | 17 |
| 12.75 mm | 17 |
| 15 mm | 19 |
| 19 mm | 35 |
| 25 mm | 50 |
| 35 mm | 70 |
Source: Craft Yarn Council’s www.YarnStandards.com. Letter and number sizes vary by brand – always go by the millimetre size printed on the package.
Frequently asked questions
What size is a US 8 knitting needle in mm?
A US 8 needle is 5 mm.
Why do some sizes have no US number?
Some metric sizes, such as 3 mm and 7 mm, have no matching US size in the standard. Use the millimetre size.
Size charts
- Crochet hook size chart
- Knitting needle to crochet hook sizes
- Yarn weight chart
- Baby and child size chart
- Adult sweater size chart
- Hat, mitten and sock size chart
- Wraps per inch (WPI) chart
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