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About 60% of all copper and copper alloys consumed in the USA are used because of the electrical conductivity of the metal, and about 80% of that is wire and cable.
So we assume that 20% of the weight of copper wire is actually copper. Here is a table of the weights of AWG/mm2 legnth cable wire with weights of different sizes of cable wire.
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There is a list at http://mdmetric.com/tech/wirewt.htm which might be more helpful. It has weights per length for standard wire sizes.
I'm improving my Macromedia flash skills and I've created a nice little calculator for you.You can see it here.
120 mm^2 has a diameter of about 6.2 mm. A diameter of 120 mm gives an area of about 45 238 mm^2.
I am using diameter (mm across the copper core) not area (mm^2) for the calculator. This is so you can use enter the values in directly from the measurements and don't need to calculate anything first. If you have a handheld computer (PocketPC for example) with Flash you could put the calculator on there and with a micrometer and tape measure, you would have a portable tool.
I could change the calculator to use area if you need that.
Version 2 of the calculator has been uploaded to the same location.