Calculate cubic feet of soil mix needed to fill raised garden beds of any shape.
Raised beds hold more than they look like they should: a 4-by-8-foot bed barely knee-high swallows more than a cubic yard of soil. This tool turns bed dimensions into the cubic feet of soil mix needed to fill them, including footprints beyond plain rectangles. You enter length, width, and depth; it multiplies area by depth, converting inches to feet so the answer lands in cubic feet, the unit printed on soil bags. The figure people most often get wrong is depth: enter how deep you will actually fill the bed, not the height of the boards, and measure inside the frame.
A concrete input and expected output from the current implementation.
Input
Length 6 ft, width 3 ft, depth 10 in
Expected output
15 cubic feet of soil mix
The footprint is 6 x 3 = 18 square feet, and 10 inches converts to 10/12 of a foot, so the volume is 18 x 10/12 = 15 cubic feet. Depth entered in inches is divided by 12 before the final multiplication.
Volume is footprint area multiplied by depth, all in feet. For a rectangular bed the tool multiplies length by width by depth, first dividing any inch measurement by 12: 10 inches becomes 0.833 foot. Because soil is sold by volume, not weight, the answer in cubic feet converts directly to bag counts and delivery quantities.
A non-rectangular bed follows the same rule: find the area of its footprint, then multiply by depth. A circular bed uses pi times the radius squared; an L-shaped bed is two rectangles added together. The result stays in cubic feet. Bulk soil is quoted per cubic yard, so divide the figure by 27 to convert.
That bed takes 32 cubic feet (4 x 8 x 1). In 2-cubic-foot bags that is 16 bags; in 1.5-cubic-foot bags it is about 22 (21.33, rounded up). The tool returns cubic feet, so you divide by the bag size you actually buy, and because soil settles, one or two extra bags are rarely wasted.
Delivered soil is measured loose and fluffy, while the calculator gives the bed volume at its settled, in-place density. The same load packs down noticeably once watered and tamped, which is why orders sized exactly to the calculator often run short. Ordering 10-15 percent extra is the usual fix.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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