Mulch & Soil Calculator Mulch & Soil Calculator Never Overestimate Mulch Again. Find Your Square Footage And The Calculator Does The Rest Enter the Total Area You Want To Mulch: square feet Desired Depth of Mulch: inches Galbraith's Generally Recommends 3-4 Inches Of Mulch Total Cubic Yards Needed: Formulas For Determining Total Area Rectangle: Total Area = (Length) X (Width)Circle: Total Area = (Pi, 3.14) X (Radius Squared)Triangle: Total Area = (1/2) X (Length of Base) X (Length of Height) Additional Information 1 Cubic Yard = 9 Three Cubic Foot Bags Or 13.5 Two Cubic Foot BagsExample: If Calculator Says You Need 6 Cubic Yards, Then You Would Need 54 Three Cubic Foot Bags or 81 Two Cubic Foot Bags To Complete Your Project If you have any questions that are not answered here, we invite you to call us and we will be happy to answer your questions over the phone.