Knitting Needle Size Conversion Chart

Friday, January 3rd, 2014
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Knitting needle size check

I’ve been working on a sweater recently, and needed to figure out some obscure needle size conversions. I found two sites (here and here) that had the information I needed, and I decided to integrate them together for a single, massive conversion chart for American, British and Japanese needles. Here are the fruits of my labour! Hope this is useful to someone.

Metric (mm) US* UK Exact UK diam. (mm)** JP Exact JP diam. (mm) Old US*** (standard needles) Old US*** (steel DPNs)
0.450 26 0.46
0.500 8/0 25 0.51
0.550 24 0.56
0.600 23 0.61
0.650
0.700 22 0.71
0.750 6/0
0.800 21 0.81
0.850
0.900 20 0.91
0.950
1.000 5/0 19 1.02 18
1.125 17
1.250 4/0 18 1.22 16
1.375 17 1.42
1.500 000 15
1.625 16 1.63
1.750 00 15 1.83 14
Metric (mm) US* UK Exact UK diam. (mm)** JP Exact JP diam. (mm) Old US*** (standard needles) Old US*** (steel DPNs)
2.000 0 14 2.03 0 2.1 0 13
2.250 1 13 2.34 12
2.500 1 1 2.4 1
2.750 2 12 2.64 2 2.7 2 11
3.000 2 11 2.95 3 3.0 3 10
3.250 3 10 3.25 4 3.3
3.500 4 5 3.6 4 9
3.750 5 9 3.66 5 8
4.000 6 8 4.06 6 3.9
4.250 7 4.2 6
4.500 7 7 4.47 8 4.5
4.750 9 4.8 7
5.000 8 6 4.88 10 5.1 8
5.250 9
5.500 9 5 5.39 11 5.4
5.750 12 5.7 10
6.000 10 4 5.89 13 6.0
6.250 14 6.3
6.500 10.5 3 6.40 15 6.6 10.5
Metric (mm) US* UK Exact UK diam. (mm)** JP Exact JP diam. (mm) Old US*** (standard needles) Old US*** (steel DPNs)
7.000 2 7.01 7mm 7.0
7.500 1 7.62
8.000 11 0 8.23 8mm 8.0
8.500
9.000 13 00 8.84 9mm 9.0
9.500 000 9.45
10.000 15 4/0 10.16 10mm 10.0
11.000 5/0 10.97
12.000 17 6/0 11.79
13.000 7/0 12.70
14.000 18
15.000
16.000 19
17.000
18.000
19.000 35
20.000
25.000 50

If you have any questions about this chart, leave them in the comments!

* Exact US diameters are the same as the first column (“Metric”).

** Exact UK diameters were retrieved from the Wikipedia entry on Standard Wire Gauge.

*** Old US sizes are from a Boye needle gauge reprinted in 1942.

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