DIY Pea Gravel Patio | Lowe's
To estimate how much gravel you'll need for a patio, multiply the desired depth of gravel by the length and width of the patio layout. For Example: To determine how much gravel you'd need for a 10-foot-by-10-foot patio layout with 2-1/2 inches of gravel, you'd perform the following calculation: 2-1/2 inches x 120 inches x 120 inches ...