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).
Use the metric system, it's more practical. Just do width * height * lenght of the area. This will get you something in CM^3. Then just do / 100^3 and you have M^3, the bags of concrete you buy will say how much M^3 you can pour with it.
One yard of concrete will cover approximately 90 square feet at a depth of 3-1/2". At an even 3-1/2", you will need just over 3 yards. This does not allow for any footings, turndowns, or a thicker slab.
15X15X.33(4/12 there is 4 inches in a foot therefor 4" is .33 of a foot) equals 74.25 cf of concrete divide by 27 (three demensional object for yards) 2.75 Cubic Yards. if you try to order .75 cubic yards of concrete you will be laughed at, just order 3 cubic yards and make a entrance path. good luck.
To calculate the volume of concrete needed for a slab, you can use the formula: Volume = Area × Thickness. First, convert the thickness from inches to feet: 4 inches is 1/3 feet. Then, multiply the area (256 square feet) by the thickness (1/3 feet): 256 × (1/3) = approximately 85.33 cubic feet of concrete is needed for the slab.
2000 pounds
That depends on how deep (thick) you need it to be. You'll need 1 yard of concrete for every 3/4 inch of thickness of the pad.
8
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Most bags will make a 1/3 of a cubic foot of concrete.
(x2 - 3)(x2 + 3)(x4 + 9)
3 cubic feet of it.
How mush is a price of 5 yards of concrete delievered
1 60lbs bag makes around a 1' by 1' by 3" thick pad..
96 cubic feet of concrete
x8
Yards are for measuring length not volume. Cubic yards required will be as follows: 1 cubic yard = 3 feet x 3 feet x 3 feet = 27 cubic feet Your concrete pad is 30ft x 40ft x 0.3333ft (4 inches assumed) = 400 cubic feet 400 divided by 27 = 14.8148 cubic yards required