Steel is typically 490 lb/cubic foot. There are 1,728 square inches in a cubic foot which means that each cubic inch weighs about .284 pounds (just a bit over a quarter of a pound per square inch).
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Depends, of course, on the density of the steel.
The density of steel alloy varies depending on its constituents and ranges between 7,750 and 8,050 kg/cu mtr (4.48 and 4.65 oz/cu in).It will therefore weigh between 645.12 and 669.6 ounces.
The weight of 1 foot of steel rod would depend on the diameter of the rod.
The weight of 4.2mm Aluminium Checker Plate is 1.02 Pounds/ Square Foot OR 4.98kg/ Square meter.
Got a calculator? Multiply 4 X 12 X 8 X 12 X 0.5 X 0.283 answer is pounds (lbs) LINK: http://wiki.answers.com/Q/What_is_the_density_of_low_grade_steel