Re: weight to length with copper wire. Originally posted by vrmatroja View Post. 240 sq. mm copper cable 1 mtr length weight to be find. There is 100mmÂ² in 1cmÂ², and there is 100cm in 1m. copper has a density of about 8.92g/cc, so 2.4cmÂ² x 100cm x 8.92 = 2141g, or 2.14kg per meter.