How much gravel is needed to cover 255 sq feet 6 inches deep?

To determine the amount of gravel needed, first convert the depth from inches to feet: 6 inches is 0.5 feet. Then, multiply the area by the depth: 255 sq ft × 0.5 ft = 127.5 cubic feet of gravel required. If you're purchasing gravel, consider that gravel is typically sold by the cubic yard; thus, you would divide 127.5 cubic feet by 27 (the number of cubic feet in a cubic yard) to get approximately 4.72 cubic yards needed.