As this is not the case here is a helpful list of knitting needle sizes.
You'll notice for every metric size there isn't always an alternative USA or UK size as indicated by a long dash. For example: Metric 2.5mm needles have neither a USA or UK equivalent hence the long dashes in both USA and UK columns.
US Metric UK
- 0 2 mm 14
- 1 2.25mm 13
- — 2.5mm —
- 2 2.75mm 12
- — 3 mm 11
- 3 3.25mm 10
- 4 3.5mm —
- 5 3.75mm 9
- 6 4 mm 8
- 7 4.5mm 7
- 8 5 mm 6
- 9 5.5mm 5
- 10 6 mm 4
- 10½ 6.5mm 3
- — 7 mm 2
- — 7.5mm 1
- 11 8 mm 0
- 13 9 mm 00
- 15 10 mm 000
- 17 12 mm —
- 19 15 mm —
- 36 20 mm —
- 50 25mm —
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