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Short Answer: About 50 lbs per foot square by 4" slab

Detailed Calculation:

A number of references online give the density of concrete as 2400 Kg/m^3 which is about the density of solid limestone often used as the agregate in concrete. Given that there are exactly 2.20462262 lbs per kilogram and 39.3700787 inches per meter that works out to about 0.0867 lbs per cubic inch.

Assuming you meant a 12" by 12" by 4" slab that is 576 cubic inches times .0867 which works out to 49.94 lbs per 12" x 12" x 4" slab

So in the future it should be easy to remember that a square foot of concrete that is four inches thick weighs about 50 pounds.

Keep in mind that different types of concrete may vary in density depending on the type of cement used, amount of water, type and size of aggregate mixed in how much sand etc. Fortunately most type of stone and sand used for concrete are pretty close in density and the excess water in the mix will evaporate. So 50 pounds per square foot 4" deep is probably a good estimate in most cases as long as there isn't a lot of steel reinforcing bar or wire embedded in the concrete. Steel is about three times as dense as stone.

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