Wire gauge conversion tables
I found these conversion charts at a metalwork forum.
Mini knitters may be interested in knowing that non-metric UK knitting needle sizes are equivalent to the British SWG wire gauge. I don't know how US knitting needle sizes are defined.
American wire gauge
| mm |
inch |
B&S (gauge) |
| 6.54 |
.2576 |
2 |
| 5.19 |
.2043 |
4 |
| 4.11 |
.1620 |
6 |
| 3.26 |
.1285 |
8 |
| 2.59 |
.1019 |
10 |
| 2.05 |
.0808 |
12 |
| 1.63 |
.0641 |
14 |
| 1.29 |
.0508 |
16 |
| 1.02 |
.0403 |
18 |
| 0.813 |
.0320 |
20 |
| 0.643 |
.0253 |
22 |
| 0.511 |
.0201 |
24 |
| 0.404 |
.0154 |
26 |
| 0.330 |
.0126 |
28 |
| 0.254 |
.0100 |
30 |
| 0.200 |
.0079 |
32 |
| 0.160 |
.0063 |
34 |
| 0.127 |
.0050 |
36 |
| 0.102 |
.0040 |
38 |
| 0.081 |
.0032 |
40 |
(British) Standard Wire Gauge
| SWG |
inch |
mm |
| 7/0 |
.500 |
12.70 |
| 6/0 |
.464 |
11.79 |
| 5/0 |
.432 |
10.97 |
| 4/0 |
.400 |
10.16 |
| 3/0 |
.372 |
9.45 |
| 2/0 |
.348 |
8.84 |
| 1/0 |
.324 |
8.23 |
| 1 |
.300 |
7.62 |
| 2 |
.276 |
7.01 |
| 3 |
.252 |
6.40 |
| 4 |
.232 |
5.89 |
| 5 |
.212 |
5.38 |
| 6 |
.192 |
4.88 |
| 7 |
.176 |
4.47 |
| 8 |
.160 |
4.06 |
| 9 |
.144 |
3.66 |
| 10 |
.128 |
3.25 |
| 11 |
.116 |
2.95 |
| 12 |
.104 |
2.64 |
| 13 |
.092 |
2.34 |
| 14 |
.080 |
2.03 |
| 15 |
.072 |
1.83 |
| 16 |
.064 |
1.63 |
| 17 |
.056 |
1.42 |
| 18 |
.048 |
1.22 |
| 19 |
.040 |
1.016 |
| 20 |
.036 |
0.914 |
| 21 |
.032 |
0.813 |
| 22 |
.028 |
0.711 |
| 23 |
.024 |
0.610 |
| 24 |
.022 |
0.559 |
| 25 |
.020 |
0.508 |
| 26 |
.018 |
0.457 |
| 27 |
.0164 |
0.417 |
| 28 |
.0148 |
0.376 |
| 29 |
.0136 |
0.345 |
| 30 |
.0124 |
0.315 |