US 9 knitting needles (5.5 mm)
US size 9 knitting needles are 5.5 mm in the Craft Yarn Council chart.
On old UK and Canadian needles and patterns the same size is number 5.
They are in the recommended needle range for 4 Medium, 5 Bulky yarn (Worsted, afghan, aran; Chunky, craft, rug).
Needles around 5.5 mm
Needles around 5.5 mm| US | mm | Old UK | Yarn weights |
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| 7 | 4.5 mm | 7 | 3 Light, 4 Medium |
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| 8 | 5 mm | 6 | 4 Medium |
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| 9 | 5.5 mm | 5 | 4 Medium, 5 Bulky |
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| 10 | 6 mm | 4 | 5 Bulky |
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| 10½ | 6.5 mm | 3 | 5 Bulky |
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Yarn weights for 5.5 mm needles
Yarn weights for 5.5 mm needles| Weight | Knit gauge | Needles |
|---|
| 4 Medium | 16–20 sts per 4 in (10 cm) | 4.5–5.5 mm (US 7–9) |
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| 5 Bulky | 12–15 sts per 4 in (10 cm) | 5.5–8 mm (US 9–11) |
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The same size in crochet hooks
A 5.5 mm crochet hook is I-9.
Sizes from the Craft Yarn Council’s Hooks & Needles standard; old UK / Canadian numbers are the wire-gauge sizes used before metric. Go by the millimeter size printed on the needle.
Other knitting needle sizes
Frequently asked questions
What size in mm is a US 9 knitting needle?
A US 9 needle is 5.5 mm.
What yarn goes with 5.5 mm knitting needles?
They are in the recommended needle range for 4 Medium, 5 Bulky yarn (Worsted, afghan, aran; Chunky, craft, rug).
Why don’t UK and US needle numbers match?
Old UK numbers come from a wire gauge where bigger numbers are thinner; US numbers grow with the needle. Millimeters are the same everywhere.