Multiply length times width. IF your driveway was 1 foot thick that would be the number of cubic feet of concrete. HOWEVER- it is only 4 inches thick. That is .33 ft (one third of a foot). So take your answer you got from multiplying LxW, and divide by 3. That will be the number of cubic feet of the driveway's volume.
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387 cubic feet. This is because 43x18x0.5 (as six inches is 1/2 of a foot) =387.
8.25 cubic yards of concrete
0.246914 cu. yards (6.666667 cu. ft ) of concrete is needed.
The number of concrete blocks in a cube depends on the size and style of the blocks. For 6-inch by 4-inch by 16-inch blocks, there are generally either 100 or 120 per cube. For blocks that are 8 inches by 8 inches by 16 inches, there are usually either 75 or 90 per cube.
128