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The density of steel varies, but if we assume it's 7.9 grams per cubic centimeter, then the weight of a 12" x 12" x 1/4" chunk can be calculated.

There are 36 cubic inches in the chunk of steel (multiply the dimensions together), and there are about 16.387064 cubic centimeters in a cubic inch. That means there are about 573.54724 cubic centimeters in 36 cubic inches. At 7.9 grams per cubic centimeter, there are about 4531.023 grams of steel in 36 cubic inches of this alloy of iron.

There are about 4531.023 grams or 4.53 kilograms, or about 9.989 (almost 10) pounds of steel in your twelve by twelve by one quarter piece.

The answer in English units is 1 square foot of 1 inch steel weighs 40.8 pounds.

take length times width in feet times the thickness in inches times 40.8 to find the weight. In answer to your question the weight would be 10.2 lbs.

1' * 1' *.250*40.8

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Q: What is the weight of a square foot of quarter inch steel plate?
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