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)
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
31 AWG	0.0404 mm²	0.2268	0.00893
32 AWG	0.032 mm²	0.2019	0.00795
33 AWG	0.0254 mm²	0.1798	0.00708
34 AWG	0.0201 mm²	0.1601	0.0063
35 AWG	0.016 mm²	0.1426	0.00561
36 AWG	0.0127 mm²	0.127	0.005
37 AWG	0.01 mm²	0.1131	0.00445
38 AWG	0.008 mm²	0.1007	0.00397
39 AWG	0.0063 mm²	0.0897	0.00353
40 AWG	0.005 mm²	0.0799	0.00314

AWG to mm²: 30 AWG

Value Details