knitting needle size guide
Knitting Needle Size Guide Chart of Metric vs US / UK / Canada Knitting Needle Sizes*:

Millimeter Size (mm)
Knitting Needle Size (US)
Knitting Needle Size (UK/CA)
2.0 mm 0 14
2.25 mm 1 13
2.75 mm 2 12
3.0 mm 11
3.25 mm 3 10
3.5 mm 4
3.75 mm 5 9
4.0 mm 6 8
4.5 mm 7 7
5.0 mm 8 6
5.5 mm 9 5
6.0 mm 10 4
6.5 mm 10.5 3
7.0 mm 2
7.5 mm 1
8.0 mm 11 0
9.0 mm 13 00
10.0 mm 15 000
12.0 mm 17
15.0 mm 19
19.0 mm 35
25.0 mm 50

*Trust the millimeter (mm) size as the letter / number can vary by manufacturer.