Figuring out how much soil you need for a standard planter box is a simple three-step process. First, measure the interior dimensions of your box: length, width, and depth in inches. For a typical rectangular box, let's use an example size of 36 inches long, 12 inches wide, and 12 inches deep. Second, multiply these three numbers together (Length x Width x Depth). In our example: 36 x 12 x 12 = 5,184 cubic inches. Finally, convert cubic inches to cubic feet or bags of soil. Since there are 1,728 cubic inches in a cubic foot, divide your total by 1,728 (5,184 ÷ 1,728 = 3). This means you need 3 cubic feet of soil. Most bagged potting mix is sold in quantities like 1.5 or 2 cubic feet, so for this box, you would purchase two 1.5-cubic-foot bags. Always remember to use potting mix, not garden soil, for proper drainage and aeration in your container garden.
How much soil do I need to fill a standard-sized urban planter box?
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