Mulch Needed to Cover a Square Foot

The formula to find the amount of mulch needed is the depth of mulch coverage times the area of the plot. A square foot has an area of 1. Standard mulch depth is 3 inches. Divide by 12 to convert to feet: you need .25 cubic feet of mulch to cover a square foot.

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About this Author

Marie Notnats enjoys learning about new topics and teaching people new skills. She has been writing professionally since 2008. She is a professional horticulturist with a Bachelor of Science degree in horticulture from Brigham Young University. She writes for,, eHow, and assorted gardening blogs.