At least 120 12-inch-by-12-inch patio pavers are needed to cover an area that is 120 square feet. The precise number may vary depending on the exact shape of the 120-square-foot area; additional pavers may be necessary if some pavers must be cut down to accommodate oddly shaped spaces.
Lowe's recommends adding a surplus of 5 to 10 percent to allow for possible breakage of pavers. This increases the minimum number for the 120-square-foot space to 126 to 132 pavers.
Lowe's also suggests beginning the patio project by digging the area to a depth of 7 inches, laying down landscape fabric, putting in a 4-inch layer of coarse gravel, and then topping it with a 1-inch layer of sand before installing the patio pavers. A 120-square-foot space would require 40 cubic feet of gravel and 13.3 cubic feet of sand.