Incredible How Much Soil Needed For Raised Garden Bed References. Determine your recipe (be sure it adds up to 100%) step 4. How many inches of soil do i need for a raised garden bed?

If you prefer an alternative with less compost to keep costs down, you can also use 70/30 soil or. How many bags of topsoil in a yard? For a 4×8 raised garden bed, you will need 15 bags of soil (1.5 cubic feet per bag) or 21.44 cubic feet of soil.