Calculate the cubic footage of your raised garden bed to get an accurate estimate of the amount of soil required to fill it. When you know the dimensions, you can do simple math to determine if you need 1, 2 or 3 cubic yards when you are ready to place an order for garden soil.
Take the measurements of your raised garden on the inside of its structure. Write the measurement of the length and the width. In this instance, multiply 4 feet by 8 feet. Next, measure from the bottom of the raised bed to the top edge to find the height. In this example, the height is 1 foot.
Calculate the square footage of the area first. Multiply the width times the length in feet. In this instance, multiply 4 by 8 to get 32 square feet.
To figure out the cubic area of your raised bed, take the square footage and multiply it by the height measurement. Take care to keep your units of measurement the same. In this instance, multiply the 32 square feet by the 1-foot height. The result is 32 cubic feet.
Soil is often sold by the cubic yard, especially when you are ordering a truck delivery. To figure how many yards of soil you need to fill the raised bed, take the cubic footage of the area inside the enclosure and divide it by 27, which is the number of cubic feet that fits into a cubic yard. In our example, to fill a raised bed with 32 cubic feet, you will need about 1.2 cubic yards of soil.
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