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How Much Soil Do You Need for a Raised Garden Bed?
Calculate raised-bed soil volume using the interior measurements and intended fill depth, then compare bagged and bulk options.
Measure the inside length and width and the depth to which you intend to fill. Use the same unit for all three numbers. If the measurements are in feet, multiply length by width by depth for cubic feet. Convert inches to feet before multiplying by dividing by 12.
Work through a real example
A bed with an inside area four feet by eight feet, filled to ten inches, takes about 26.7 cubic feet before settling. That is just under one cubic yard because one cubic yard is 27 cubic feet. If your bag holds two cubic feet, divide 26.7 by two and round up to 14 bags. Check the actual interior dimensions rather than relying on a kit’s name.
Compare delivered costs and access
Check the bag volume printed on the label, then include delivery and whether you can move the bags. A bulk order can be practical when a supplier can drop it near the bed. Ask about the minimum delivery quantity, the contents of the mix and what equipment you need to move it.
Leave room to work and water
Follow the planting guidance for your crops and keep some space below the rim for watering or mulch. University of Minnesota Extension covers filling and maintaining raised beds. Save the measurements so you can estimate a smaller top-up later.
