### stone calculator [how much stone do i need] - construction

Jun 12, 2019 · The density of the stone is 100 lb/ft³, and it costs $10 per yd³. I enter these values in the calculator which would perform the following calculations: $$Volume = \pi\ \times \biggl ( {Diameter \over 2}\biggr)^2 \times Depth = \pi\ \times \biggl ( {10 ft \over 2}\biggr)^2 \times 12\,in = 2.909 ft^3$$