Wire Gauge		Nominal Dia.		Conductor Sectional Area
AWG	SWG	mm	mil	sq.mm	sq.mil
—	18	1.219	48.0	1.168	1810.0
17	—	1.151	45.3	1.040	1612
18	—	1.024	40.3	0.8233	1276
—	19	1.016	40.0	0.8110	1257
—	20	0.914	36.0	0.6568	1018
19	—	0.912	35.9	0.6529	1012
20	21	0.813	32.0	0.5189	804.2
21	—	0.724	28.5	0.4116	637.9
—	22	0.711	28.0	0.3973	615.8
22	—	0.643	25.3	0.3243	520.7
—	23	0.610	24.0	0.2919	452.4
23	—	0.574	22.6	0.2589	401.2
—	24	0.559	22.0	0.2452	380.1
24	—	0.511	20.1	0.2047	317.3
—	25	0.508	20.0	0.2027	314.2
—	26	0.457	18.0	0.1642	254.5
25	—	0.455	17.9	0.1624	251.7
—	27	0.417	16.4	0.1363	211.2
26	—	0.404	15.9	0.1281	198.6
—	28	0.376	14.8	0.1110	172.0
27	—	0.361	14.2	0.1022	158.4
—	29	0.345	13.6	0.09375	145.3
28	—	0.320	12.6	0.08046	124.7
—	30	0.315	12.4	0.07794	120.8
—	31	0.295	11.6	0.06820	105.7
29	—	0.287	11.3	0.06471	100.3
—	32	0.274	10.8	0.05911	91.61
30	33	0.254	10.0	0.05067	78.54
—	34	0.234	9.2	0.04289	66.48
31	—	0.226	8.9	0.04014	62.21
—	35	0.213	8.4	0.03576	55.42
32	—	0.203	8.0	0.03243	50.27
—	36	0.193	7.6	0.02927	45.36
33	—	0.180	7.1	0.02554	39.59
—	37	0.173	6.8	0.023430	36.32
34	—	0.160	6.3	0.020110	31.17
—	38	0.152	6.0	0.018240	28.27
35	—	0.142	5.6	0.015890	24.63
—	39	0.132	5.2	0.013700	21.24
36	—	0.127	5.0	0.012670	19.64
—	40	0.122	4.8	0.011680	18.10
37	—	0.114	4.5	0.010260	15.90
—	41	0.112	4.4	0.009810	15.21
38	42	0.102	4.0	0.008110	12.57
—	43	0.0914	3.6	0.006567	10.18
39	—	0.0889	3.5	0.006207	9.621
—	44	0.0813	3.2	0.005189	8.042
40	—	0.0787	3.1	0.0048690	7.548
41	45	0.0711	2.8	0.0039730	6.158
42	—	0.0635	2.5	0.0031670	4.909
—	46	0.0610	2.4	0.0029190	4.524
43	—	0.0599	2.2	0.0024520	3.801
44	47	0.0508	2.0	0.0020270	3.142
45	—	0.0447	1.76	0.0015690	2.427
—	48	0.0406	1.60	0.0012970	2.011
46	—	0.0399	1.57	0.0012490	1.932
47	—	0.0356	1.40	0.0009931	1.539
48	—	0.0315	1.24	0.0007791	1.207
—	49	0.0305	1.20	0.0007296	1.131
49	—	0.0282	1.11	0.0006241	0.966
—	50	0.0254	1.00	0.0005067	0.7854
50	—	0.0252	0.99	0.0004968	0.7697
AWG=American Wire Gauge. SWG=British Leagal Standard Wire Gauge.