AWG to mm²

AWG mm²
36 0.013
34 0.020
32 0.032
30 0.051
28 0.081
26 0.129
24 0.205
22 0.326
20 0.518
18 0.823
16 1.309
14 2.081
12 3.309
10 5.261
8 8.366
6 13.302
4 21.151
2 33.361
1 42.408
1/0 53.475
2/0 67.431
3/0 85.029
4/0 107.219

mm² to AWG

mm² AWG
0.13 25.959
0.25 23.139
0.35 21.687
0.5 20.149
0.75 18.401
1 17.160
1.2 16.374
1.5 15.412
1.75 14.747
2 14.171
2.5 13.209
4 11.182
6 9.433
8 8.193
10 7.230
12 6.444
16 5.204
25 3.279
35 1.828
50 0.710/0
70 2.161/0
95 3.478/0
120 4.486/0

Explanation

A lot of wire size conversion tables out there are completely incorrect. Many label 1 AWG as 50 mm², even though it's not even close to that. This page uses the actual equations to give the correct conversions.

Here's how it works: solid 36 AWG wire is defined as 0.005 inches in diameter, and solid 4/0 wire is defined as 0.46 inches in diameter. A smaller gauge number increases the wire diameter by a constant factor. This leads to the following equation, where d is the diameter of the wire, and n is the wire gauge in AWG:

Using the formula for a circle's area, we get the following equation, where A is the cross-sectional area in mm²:

To convert from mm² to AWG, we can just invert the equation:

Solid and stranded wires of the same gauge have the same cross-sectional area, so these conversions work with both solid and stranded wire.