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 mm014
2.25 mm113
2.75 mm212
3.0 mm11
3.25 mm310
3.5 mm4
3.75 mm59
4.0 mm68
4.5 mm77
5.0 mm86
5.5 mm95
6.0 mm104
6.5 mm10.53
7.0 mm2
7.5 mm1
8.0 mm110
9.0 mm1300
10.0 mm15000
12.0 mm17
15.0 mm19
19.0 mm35
25.0 mm50

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