Figuring out how much soil you need to fill your urban planter boxes is a simple calculation that ensures you buy the right amount. First, you need to know the dimensions of a single planter box. A typical medium-sized urban planter might be about 4 feet long, 2 feet wide, and 1.5 feet deep.
The formula for volume is: Length × Width × Depth.
For one box: 4 ft × 2 ft × 1.5 ft = 12 cubic feet.
Since you have three boxes, multiply that volume by three: 12 cubic feet × 3 = 36 cubic feet.
Therefore, you will need a total of 36 cubic feet of soil to fill all three planter boxes. When you go to a garden center, soil is often sold in bags measured in cubic feet. You would simply need to buy enough bags to total 36 cubic feet. Remember, it's always a good idea to buy a little extra to account for settling. Happy gardening