Cable size quick reference.

 

AWG / Gauge	Diameter (mm)	Cross-Section ($m{m}^2$)	Common Use Case
4/0 (0000)	11.68 mm	107.0 $m{m}^2$	Main service entrance, heavy industrial
2/0 (00) 1/0 1	9.27 mm 8.25 mm 7.35mm	67.4 mm2     53.5 mm2     42.4 mm2	Battery cables, large feeders Also called 0 Welding Cable.
2	6.54 mm	33.6 $m{m}^2$	Heavy appliances, sub-panels
4	5.19 mm	21.2 $m{m}^2$	Large machinery, high-power HVAC
6	4.11 mm	13.3 $m{m}^2$	Electric ranges, large motors
8	3.26 mm	8.37 $m{m}^2$	Electric water heaters, heavy power tools
10	2.59 mm	5.26 $m{m}^2$	Dryers, AC units, high-current circuits
12	2.05 mm	3.31 $m{m}^2$	Standard 20A kitchen/bathroom outlets
14	1.63 mm	2.08 $m{m}^2$	Standard 15A lighting circuits
16	1.29 mm	1.31 $m{m}^2$	Extension cords, light-duty tools
18	1.02 mm	0.82 $m{m}^2$	Low-voltage lighting, thermostats
24	0.51 mm	0.20 $m{m}^2$	Ethernet (Cat5/6), telecommunications