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ASTM B258: Standard Specification for Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductors

The AWG size n has the nominal diameter d = 0.127 mm x 92^((36 - n) / 39), the formula the standard gives as the definition of the AWG sizes; the cross-section is pi/4 x d^2. conductor_mm and cross_section_mm2 of each data/specs/wire spec are that formula for a solid round copper conductor, rounded to 4 decimal places. Stranded wire of the same gauge has the same nominal cross-section; its strands are not in the spec. The page of the standard is not cited: the formula is cited as its definition.

Sizes (23)

Spec	Gauge (AWG)	Diameter mm	Diameter in	Cross-section mm2	Matching parts
8 AWG	8	3.2636	0.1285	8.3656	5
9 AWG	9	2.9064	0.1144	6.6342	0
10 AWG	10	2.5882	0.1019	5.2612	24
11 AWG	11	2.3048	0.0907	4.1723	2
12 AWG	12	2.0525	0.0808	3.3088	40
13 AWG	13	1.8278	0.072	2.624	11
14 AWG	14	1.6277	0.0641	2.0809	39
15 AWG	15	1.4495	0.0571	1.6502	4
16 AWG	16	1.2908	0.0508	1.3087	21
17 AWG	17	1.1495	0.0453	1.0378	0
18 AWG	18	1.0237	0.0403	0.823	6
19 AWG	19	0.9116	0.0359	0.6527	0
20 AWG	20	0.8118	0.032	0.5176	12
21 AWG	21	0.7229	0.0285	0.4105	0
22 AWG	22	0.6438	0.0253	0.3255	17
23 AWG	23	0.5733	0.0226	0.2582	0
24 AWG	24	0.5106	0.0201	0.2047	6
25 AWG	25	0.4547	0.0179	0.1624	0
26 AWG	26	0.4049	0.0159	0.1288	15
27 AWG	27	0.3606	0.0142	0.1021	0
28 AWG	28	0.3211	0.0126	0.081	1
29 AWG	29	0.2859	0.0113	0.0642	0
30 AWG	30	0.2546	0.01	0.0509	0