Just how much soil do I need to fill my landscape, garden, beds, or surround my trees? This simple soil estimator will provide you the amount of cubic feet or cubic yards you require. Bags typically have cubic feet, volumes, specified, and if you get a bulk delivery of mulch they will ask how many yards he would like.  The simple soil calculator text input of the shape of your gardening, bed, the length and width of the area, and the depth you require.