US 1 knitting needles (2.25 mm)
US size 1 knitting needles are 2.25 mm in the Craft Yarn Council chart.
On old UK and Canadian needles and patterns the same size is number 13.
They are in the recommended needle range for 0 Lace, 1 Super Fine yarn (Fingering, 10-count crochet thread; Sock, fingering, baby).
Needles around 2.25 mm
Needles around 2.25 mm| US | mm | Old UK | Yarn weights |
|---|
| 00 | 1.75 mm | — | 0 Lace |
|---|
| 0 | 2 mm | 14 | 0 Lace |
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| 1 | 2.25 mm | 13 | 0 Lace, 1 Super Fine |
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| 2 | 2.75 mm | 12 | 1 Super Fine |
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| — | 3 mm | 11 | 1 Super Fine |
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Yarn weights for 2.25 mm needles
Yarn weights for 2.25 mm needles| Weight | Knit gauge | Needles |
|---|
| 0 Lace | 33–40 sts per 4 in (10 cm) | 1.5–2.25 mm (US 000–1) |
|---|
| 1 Super Fine | 27–32 sts per 4 in (10 cm) | 2.25–3.25 mm (US 1–3) |
|---|
The same size in crochet hooks
A 2.25 mm crochet hook is B-1.
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 1 knitting needle?
A US 1 needle is 2.25 mm.
What yarn goes with 2.25 mm knitting needles?
They are in the recommended needle range for 0 Lace, 1 Super Fine yarn (Fingering, 10-count crochet thread; Sock, fingering, 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.