Use this handy chart for converting knitting needle sizes. You'll find it especially helpful if you're knitting from an old knitting pattern or one of the many knitting patterns we sell here at Tangled Yarn that are from the USA.

Metric (mm)
UK (old)
 USA
2 14 0
2.25 13 1
2.5 - 1.5
2.75 12 2
3 11 -
3.25 10 3
3.5 - 4
3.75 9 5
4 8 -
4.25 - 6
4.5 7 7
5 6 8
5.5 5 9
6 4 10
6.5 3 10.5
7 2 -
7.5 1 -
8 0 11
9 00 13
10 000 15
12 - 17