US 4 knitting needles (3.5 mm)
US size 4 knitting needles are 3.5 mm in the Craft Yarn Council chart.
There is no common old UK / Canadian number for this size.
They are in the recommended needle range for 2 Fine yarn (Sport, baby).
Needles around 3.5 mm
Needles around 3.5 mm| US | mm | Old UK | Yarn weights |
|---|
| — | 3 mm | 11 | 1 Super Fine |
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| 3 | 3.25 mm | 10 | 1 Super Fine, 2 Fine |
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| 4 | 3.5 mm | — | 2 Fine |
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| 5 | 3.75 mm | 9 | 2 Fine, 3 Light |
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| 6 | 4 mm | 8 | 3 Light |
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Yarn weights for 3.5 mm needles
Yarn weights for 3.5 mm needles| Weight | Knit gauge | Needles |
|---|
| 2 Fine | 23–26 sts per 4 in (10 cm) | 3.25–3.75 mm (US 3–5) |
|---|
The same size in crochet hooks
A 3.5 mm crochet hook is E-4.
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 4 knitting needle?
A US 4 needle is 3.5 mm.
What yarn goes with 3.5 mm knitting needles?
They are in the recommended needle range for 2 Fine yarn (Sport, baby).
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.