How Much Gravel Is Needed for a Brick Paver Patio?

Measure the Site

• To figure the amount of gravel you need for a patio foundation, calculate the exact dimensions of the site. Plant stakes at each corner of the site and measure the length and width using a tape measure. Multiply the length and width of a rectangular site to find the square footage. The square footage is necessary to calculate the gravel, sand and number of bricks needed for the patio.

Calculating Cubic Feet

• Walkways and patios require less gravel than driveways because they are exposed to lighter weight loads. The foundation for a brick patio should be at least 4 inches thick. Calculate the amount of gravel needed in cubic feet by multiplying the square footage by one-third since 4 inches is one-third of a foot. If your soil has poor drainage and you want a thicker foundation, adjust the formula accordingly. For instance, multiply square footage by one-half to install a 6-inch thick foundation.

Calculating Cubic Yards

• Whether you order gravel from a home improvement shop or landscaping company, most places sell it in cubic yards. Once you know how many cubic feet of gravel are needed for the foundation, divide this number by 27 and round up to the nearest half.

Order Extra

• It's advantageous to order 5 to 10 percent more gravel than necessary. The extra amount accounts for spillage and gives you flexibility to slightly adjust the size or shape of the site. Once the patio is complete, use the gravel for a small path or spread it around the grill or fire pit for a fire-resistant border.