Wire thickness is measured in gauge; in North America, American Wire Gauge (AWG) is the standard notation.  The table below provides conversion to inches for solid, round, and bare conductors (insulation removed). A larger AWG number indicates a smaller conductor.

Typical household wire for a 15-amp circuit is 14 AWG. 12 AWG wire is generally used on 20-amp circuits.

AWG
Gauge
Conductor
Diameter
0000.46
000.4096
00.3648
0.3249
1.2893
2.2576
3.2294
4.2043
5.1819
6.1620
7.1443
8.1285
9.1144
10.1019
11.0907
12.0808
13.0720
14.0641
15.0571
16.0508
17.0453
18.0403
19.0359
20.0320
21.0285
22.0253
23.0226
24.0201
25.0179
26.0159
27.0142
28.0126
29.0113
30.0100
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