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There are three primary scales on which the size of Knitting needles are measured: the US/American, UK/English, and Metric. The US and Metric scales are by far the most common these days, and so you're only likely to encounter the UK/English scale if you've acquired a set of older needles. Nonetheless, a Needle Gauge is an invaluable tool for measuring needle sizes and performing conversions.

The following table provides conversions between the different scales:

Knitting Needle Sizes
US/American Metric (mm) UK/English
000 1.50 15
00 1.75 14
0 2.00 13
1 2.25 12
2 2.75 11
3 3.25 10
4 3.50 9
5 3.75 8
6 4.00 7
7 4.50 6
8 5.00 5
9 5.50 4
10 6.00 3
10 1/2 6.50 2
11 8.00 1
13 9.00 00
15 10.00 000
17 12.00 -
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