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When you purchase mulch for delivery, it’s usually by the cubic yard, so you’ll want to convert your space to cubic yards to get the right amount. First, determine the square footage of the area you want to cover, and then determine how deep the bed of mulch will be—a good rule of thumb is around three inches. Multiply your square footage in feet by the depth in inches and divide by 324. You may want to add a ½ to one additional cubic yard to ensure you have enough.

A 50-pound bag of pea gravel equals approximately one-half of a cubic foot. That amount will cover a three-square-foot area to a depth of about two inches. A three-square-foot area with equal-length sides is approximately 1.73 feet by 1.73 feet, or about 20.75 inches on each side.

No one likes running out of materials during a project, so calculating the right amount of gravel needed for your driveway is an absolute must. Multiply your driveway’s length by width by the depth of the gravel (in feet). For gravel depth, convert to a decimal (i.e., 4 inches is 0.33 feet). This will give you the cubic feet of material that you need. 

If you’re looking for cubic yards, divide that above number by 27.

While you don’t need to put anything down before mulch, you can apply a pre-emergent herbicide to prevent weed growth. As long as you remove weeds before you spread mulch, you should be in the clear. But a herbicide is something that you can put down before mulch as an extra layer of protection.