Knitting needle to crochet hook sizes
Needles and hooks of the same millimetre size, side by side. Note that crochet usually needs a larger hook than the needle you would knit the same yarn with.
| Metric | Knitting needle | Crochet hook |
|---|---|---|
| 2.25 mm | US 1 | B-1 |
| 2.75 mm | US 2 | C-2 |
| 3.125 mm | US 3 | D |
| 3.25 mm | US 3 | D-3 |
| 3.5 mm | US 4 | E-4 |
| 3.75 mm | US 5 | F-5 |
| 4 mm | US 6 | G-6 |
| 4.25 mm | US 6 | G |
| 4.5 mm | US 7 | 7 |
| 5 mm | US 8 | H-8 |
| 5.25 mm | US 9 | I |
| 5.5 mm | US 9 | I-9 |
| 5.75 mm | US 10 | J |
| 6 mm | US 10 | J-10 |
| 6.5 mm | US 10½ | K-10½ |
| 7 mm | – | – |
| 8 mm | US 11 | L-11 |
| 9 mm | US 13 | M/N-13 |
| 10 mm | US 15 | N/P-15 |
| 15 mm | US 19 | P/Q |
| 19 mm | US 35 | S |
| 25 mm | US 50 | T/U/X |
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.
Size charts
- Knitting needle size chart
- Crochet hook size chart
- 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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