Wire Gauge Tables

Wire sizes are based on traditional imperial size draw ratios or `Gauges’ developed in the 19th century. As a result of wire development on different continents, the modern wire industry uses TWO wire gauge tables; either

  • AWG = American Wire Gauge ( Brown & Sharpe Gauge 1855) or
  • SWG = Standard wire gauge ( British Standard wire gauge)

Although there are some similarities between these two tables, many wire gauges have different diameters. For example: a 12 g SWG=2.63mm , yet 12g AWG=2.05mm diameter wire.

To add to the confusion!!

SQUARE: Wire used in the electrical industry is typically supplied as Cable or multi stranded wire made up of a number of individual strands of wire. Cable is sized by its CROSS.

SECTIONAL AREA also commonly called SQUARE, as in square mm. For example a 6mm² or 6mm square single wire has a diameter of 2.77mm.

Metal Gauges: Wire gauge tables should NOT be confused with Gauges used to identify thickness of sheet metal. Sheet metal gauges ( now considered archaic) are based on weight per area ratios and are not interchangeable nor have any correlation with wire gauge tables.

To avoid confusion all wire should be referenced in wire diameter either metric(mm) or imperial (thousands of inch).

Before ordering your wire ensure you have referenced the correct Gauge table AWG or SWG for your specification and provide us with either an imperial or metric wire diameter conversion.

American Wire Gauges

Guage inch mm
000 (3/0) 0.4096 10.405
00 (2/0) 0.3648 9.266
0 (1/0) 0.3249 8.252
1 0.2893 7.35
2 0.2576 6.544
3 0.229 5.83
4 0.204 5.19
5 0.182 4.62
6 0.162 4.11
7 0.144 3.66
8 0.128 3.26
9 0.114 2.91
10 0.102 2.59
11 0.091 2.31
12 0.081 2.05
13 0.072 1.83
14 0.064 1.63
15 0.057 1.45
16 0.051 1.29
17 0.045 1.15
18 0.040 1.02
19 0.036 0.911
20 0.032 0.812
21 0.280 0.72
22 0.025 0.64
23 0.023 0.57
24 0.020 0.51
25 0.018 0.45
26 0.016 0.40
27 0.014 0.36
28 0.013 0.32
29 0.011 0.29
30 0.010 0.25
31 0.009 0.23
32 0.008 0.20
33 0.007 0.18
Rows with grey brackground are Common Sizes

Standard Wire Gauges

Guage inch mm
3/0 0.372 9.5
2/0 0.348 8.84
0 0.324 8.23
1 0.3 7.62
2 0.276 7.01
3 0.252 6.4
4 0.232 5.89
5 0.212 5.39
6 0.192 4.88
7 0.176 4.47
8 0.160 4.06
9 0.144 3.66
10 0.128 3.25
11 0.116 2.95
12 0.104 2.64
13 0.092 2.34
14 0.080 2.03
15 0.072 1.83
16 0.064 1.63
17 0.056 1.42
18 0.048 1.22
19 0.04 1.02
20 0.036 0.911
21 0.032 0.81
22 0.028 0.71
23 0.024 0.61
24 0.022 0.56
25 0.020 0.51
26 0.018 0.46
27 0.0164 0.41
28 0.0148 0.38
29 0.0136 0.35
30 0.0124 0.32
31 0.0116 0.30
32 0.0108 0.27
33 0.010 0.25
Rows with grey brackground are Common Sizes