Copper Wire Resistance by AWG/kcmil

Formula basis: resistance = resistivity x length / area, using copper resistivity 0.017241 ohm mm2/m at 20 C.
Conductor size	Ohms / 1000 m	Ohms / 1000 ft	Basis
14 AWG	8.2889	2.5265	copper, 2.08 mm2 area
12 AWG	5.2088	1.5876	copper, 3.31 mm2 area
10 AWG	3.2778	0.9991	copper, 5.26 mm2 area
8 AWG	2.0599	0.6278	copper, 8.37 mm2 area
6 AWG	1.2963	0.3951	copper, 13.3 mm2 area
4 AWG	0.8133	0.2479	copper, 21.2 mm2 area
3 AWG	0.6457	0.1968	copper, 26.7 mm2 area
2 AWG	0.5131	0.1564	copper, 33.6 mm2 area
1 AWG	0.4066	0.1239	copper, 42.4 mm2 area
1/0 AWG	0.3223	0.0982	copper, 53.5 mm2 area
2/0 AWG	0.2558	0.078	copper, 67.4 mm2 area
3/0 AWG	0.2028	0.0618	copper, 85 mm2 area
4/0 AWG	0.1608	0.049	copper, 107.2 mm2 area
250 kcmil	0.1361	0.0415	copper, 126.7 mm2 area
300 kcmil	0.1134	0.0346	copper, 152 mm2 area
350 kcmil	0.0972	0.0296	copper, 177.3 mm2 area
400 kcmil	0.0851	0.0259	copper, 202.7 mm2 area
500 kcmil	0.068	0.0207	copper, 253.4 mm2 area
600 kcmil	0.0567	0.0173	copper, 304 mm2 area
750 kcmil	0.0454	0.0138	copper, 380 mm2 area
1000 kcmil	0.034	0.0104	copper, 506.7 mm2 area

Use notes

Use this table for preliminary reference and arithmetic checks only.
Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.

Reference table