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A chart of knitting needle sizes in millimeters and their corresponding codes used in the US, UK, and Canada.

If you are not sure what size needle should be used for your yarn, this rule of thumb may help: choose needle diameter that is twice the diameter of your yarn.

Metric, mmUS StandardUK & Canada Standard
1.50
1.750
2014
2.25113
2.5
2.75212
311
3.25310
3.54
3.7559
468
4.25
4.577
4.7586
586
5.595
6104
6.510 1/23
72
7.51
8110
9130
10150
1217
1619
1935
2550
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