Volume of concrete needed = 4 x 12 x 1/3 = 4 x 4 = 16 cubic feet
540 square feet
You will need 200 cubic feet.
12.30 cubic yards
It depends on how thick you want the concrete.
2.15
14.81 yds
how many cubic feet in a yard of concret
12.5 cubic feet. Assuming you meant 4 INCHES thick..
If it is 4 inches deep/thick, 2 cubic yards. If it is 6 inches deep/thick, 3 cubic yards.
you can do the math: LXWXD DIVIDED BY 27
625 times 0.5 = 312.5 cubic feet will be needed
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.
387 cubic feet. This is because 43x18x0.5 (as six inches is 1/2 of a foot) =387.
A 10-foot round slab at 4 inches requires 1 cubic yard.
Volume of concrete needed = 4 x 12 x 1/3 = 4 x 4 = 16 cubic feet
That is about 135 cu ft., or 5 yards