Start with more information. Is this on the 12th floor of a building or on the ground? If on the ground, what was the soil prep like? Is it prestressed? Is it double T? Is it poststressed? What is the composition of the concrete?
The simple answer: Hire a civil engineer to tell you.
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square feet
A square foot of concrete has no weight because a square foot has no thickness. A cubic foot of concrete would weigh 65 Kg (143 lb) If you ASSUMED that concrete driveways, paths, etc. are all the same thickness , which they are NOT, then let us say they are 4 inch thick (10cm) In that case, then 1Square Ft of Concrete would weigh one third of the figure given above. Therefore it weighs 48 lb which is the same as 22 Kg.. Density of Concrete is 34.4 gram per cubic Inch or 1.216 ounce per cubic inch. (since you seem to be wanting to use Imperial measure)
An inch is a unit of distance. A square foot is a unit of area. The two units are therefore incompatible.
One square inch is 1/144 of a square foot.1 square inch = 0.006944 square foot (rounded)1 square foot = 144 square inches
12*50/6=100 100 square yards
1 square inch = 0.006944 square foot (rounded) 1 square foot = 144 square inches
There is no universal formula to calculate area - it depends on the shape in question. 1 square inch = 1 inch * 1 inch = 1/12 foot * 1/12 foot = 1/12 * 1/12 square feet = 1/144 square feet. So to convert an area given in square inches to square feet, divide by 144.
Yes, a square foot is 12 times bigger than a square inch. You use this same conversion as if it were not squared; an inch is smaller than a foot.
Cooper weighs 542 lbs. per square foot. So, 542 divided by 1,728 (the number of inches per square foot). One cubic inch of copper weighs 0.31 lbs., or about 5 ounces.
1 square ft= 144 square inch
I would think about a smaller unit of measurement. Perhaps square foot, or square inch. Square foot would be ideal. If you are doing it yourself, you can make grids on the counter top using a ruler