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Concrete, gravel, mulch, or fill from length, width, and depth.
Also: Square footage · Asphalt
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Cubic yards = (length ft × width ft × depth ft) ÷ 27. If depth is in inches, divide inches by 12 first. Add extra so you do not come up short.
One cubic yard is 27 cubic feet. An 80-lb bag is about 0.6 cubic feet, so about 45 bags per yard. This page counts bags when the material is concrete.