Want this question answered?
A minimum of 1.3 cubic yards.
Oops . . . please repost your question and include the depth of the concrete. You have to have all 3 dimensions in order to calculate volume (Cubic Yards of concrete).
It is impossible to answer the question as asked because square feet is a measure of area and a "yard of concrete" actually refers to a cubic yard of concrete. However, if we make a couple assumptions we can answer the question I THINK you're asking which is, "How many square feet of concrete does one cubic yard of concrete yield if poured to a typical depth of 4 inches?" The inches of depth can be changed to suit the situation, but in any case giving the poured concrete a depth turns it into a volume which makes it easier to compute the area a cubic yard of concrete will cover. To begin, we need to convertt the square footage of concrete (which is an area) to a volume. Let's use 6 inches for the depth: 12" x 12" x 6" = 864in^3 or 864 cubic inches This is the number of cubic inches of concrete in one square foot of concrete poured to a depth of 6 inches. Now we put a cubic yard into the same terms, cubic inches: 36" x 36" x 36" = 46,656 in^3 or 46,656 cubic inches of concrete. Now we simply divide number of cubic inches of concrete in a yard of concrete by the number of cubic inches in a square foot of concrete poured to a depth of 6 inches: 46656 / 864 = 54 square feet. By the way, there are 27 cubic feet in a cubic yard and you may notice that 27 x 2 = 54. That's a result of the depth I chose for the poured concrete--6 inches. A square foot of concrete poured to a depth of 6 inches is equal to one half cubic foot of concrete. 27 / .5 = 54 If you want to figure square foot yield per yard when you pour the slab at 4 inches instead of 6 inches, then simply substitute 4" in the equations for 6". (36" x 36" x 36") / (12" x 12" x 4") = 81 square feet.
12 ft x 10 ft x .333 ft (4 in) = 39.96 cu ft. You need enough concrete for 40 cubic ft.
An 80lb bag of concrete you can at your local home improvement store covers about 4 square foot at 2" thick. So you would need about 144 bags of 80lb concrete.
A minimum of 1.3 cubic yards.
18x32 feet by 4 inches thick: 7.1 cubic yards. For a 6-inch slab, 10.7 cubic yards.
about 432 cubic inches
You need several quantities to calculate concrete volume for corrugated metal decking. You need both the flute height in inches, flute width in inches, flute foot in inches, sealant depth or thickness in inches, gap size in inches, and deck length in feet.
A 9x9 foot slab 4 inches thick requires a minimum of 1 cubic yard. If you go to 6 inches thick you will need 1.5 cubic yards.
To calculate volume, all the dimensions should be converted to the same unit, so that the volume will be in cubes of that unit. Since there are 12 inches in one foot, 4 inches = 1/3 foot. Multiplying the three dimensions together yields 700/3 cubic feet of concrete required, or as a decimal, 233.33....
Since a foot has 12 inches, all you need to do is divide by 12.
Half a cubic foot.
It depends on the concrete company you're working with. You need 33 yards of concrete. Concrete companies deliver the stuff in full truckloads - and no, this is NOT a job for Sakrete. If you can find a company that has Oshkosh front-load mixers, you'll need three truckloads because those trucks hold 11 yards. If you can only find companies with rear-load mixers, you need 36 yards because a rear-load mixer holds 6 yards of concrete.
None, as a hole which is 6 inches wide and 42 inches long has no depth and thus no volume.
12.30 cubic yards
9 inches does not complete a foot, but it is 3/4 (.75) of a foot.... 12 inches is a foot.