Question 1

What is the AWG to mm² formula?

Accepted Answer

Use area(mm²) = 0.012668 × 92^((36 - AWG) / 19.5). Larger conductors have lower AWG numbers.

Question 2

How do I convert mm² back to AWG?

Accepted Answer

Rearrange the formula: AWG = 36 - 19.5 × log(mm² / 0.012668) / log(92). Then round to a standard gauge size.

Question 3

Is AWG linear?

Accepted Answer

No. AWG is logarithmic, so each gauge step changes cross-sectional area by a fixed ratio, not a fixed increment.

Question 4

Why include diameter values?

Accepted Answer

Diameter is useful for conduit fill and mechanical fit checks, while mm² is used for current and resistance calculations.

AWG	Area (mm²)	Diameter (mm)	Diameter (in)
10 AWG	5.2613 mm²	2.5882	0.1019
11 AWG	4.1724 mm²	2.3049	0.09074
12 AWG	3.3089 mm²	2.0526	0.08081
13 AWG	2.624 mm²	1.8278	0.07196
14 AWG	2.081 mm²	1.6277	0.06408
15 AWG	1.6503 mm²	1.4496	0.05707
16 AWG	1.3087 mm²	1.2909	0.05082
17 AWG	1.0379 mm²	1.1495	0.04526
18 AWG	0.8231 mm²	1.0237	0.0403
19 AWG	0.6527 mm²	0.9116	0.03589
20 AWG	0.5176 mm²	0.8118	0.03196
21 AWG	0.4105 mm²	0.723	0.02846
22 AWG	0.3255 mm²	0.6438	0.02535
23 AWG	0.2582 mm²	0.5733	0.02257
24 AWG	0.2047 mm²	0.5106	0.0201
25 AWG	0.1624 mm²	0.4547	0.0179
26 AWG	0.1288 mm²	0.4049	0.01594
27 AWG	0.1021 mm²	0.3606	0.0142
28 AWG	0.081 mm²	0.3211	0.01264
29 AWG	0.0642 mm²	0.2859	0.01126
30 AWG	0.0509 mm²	0.2546	0.01003

AWG to mm²: 20 AWG

Value Details