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it's about 10 lbs per square foot. (Multiply the density of steel, about 490 pounds per cubic foot, times the thickness of the plate in feet, 1/4 in. = .02 ft.) I'm assuming you mean 1/4 in. plate.

12 inches divided by .250 inches = 48

1 foot divided by 48 = 0.020833

1 square foot of steel would weight 490 times 0.020833 = 10.20833 LBS

Plate Thickness Lbs/sq ft Lbs/sq In
1/8   Inch 5.104166667 0.0354456
3/16 Inch 7.65625 0.0531684
1/4   Inch 10.20833333 0.0708912
5/16 Inch 12.76041667 0.088614
3/8   Inch 15.3125 0.10633681
7/16 Inch 17.86458333 0.12405961
1/2   Inch 20.41666667 0.14178241