What the comparisons cover
The guide covers raised beds, elevated planters, flexible containers and a small set of watering-kit families sold in the US. We compare dimensions, growing depth, materials, assembly and documented connections. These pages do not report hands-on product tests.
Where the details come from
Each product page links to the product documents used for that model. Advice pages link to the sources supporting their recommendations. A photograph identifies the product pictured; it does not establish which fittings or accessories are included in every bundle.
How fill is calculated
Rectangular fill is inside length × inside width × filled depth. Circular fill is π × radius² × filled depth. Tapered pots use the frustum formula, with the diameter at the fill line reduced when you leave headspace. Inches are converted to cubic feet by dividing cubic inches by 1,728; a cubic yard is 27 cubic feet.
Bag quantities round up to whole bags of the size you enter. A purchasing buffer increases the order quantity, not the physical bed volume. Stated product capacities stay separate from calculated fill because the manufacturer may use different dimensions or fill assumptions.
Layout checks use outside footprints and your chosen path width. Reach is calculated from the sides you mark as accessible. A round bed needs access around its rim for the whole-rim reach check. These are geometric checks, not accessibility certification.
When product details change
The current catalog was last updated on September 7, 2026; the Sources page gives the date for each maker, extension service and agency. Product ranges, bundles and delivery options can change. Current prices remain at the retailer; they are not copied into the guide. Product photos supplied through Amazon are removed automatically when their image record expires.
What the result can’t tell you
The tools cannot approve a balcony, roof or deck load, diagnose contaminated soil, prescribe a watering schedule or guarantee plant growth. A container’s load rating does not establish the load capacity of the surface beneath it.
An irrigation result applies to the exact kit and inputs shown. A matching nominal tube diameter alone does not prove that another brand’s fitting will seal. Missing operating limits or conflicting fit instructions prevent a complete fit recommendation.
Report a correction
Use the contact form to report a figure that looks wrong, with the page and, if you have one, the maker’s page that shows the right figure. Every figure links to its source; where a figure here and its source disagree, follow the source. A correction may change the comparison, the available preset or the result of a fit check.
Yard-material calculations
The yard calculators add the areas you enter and subtract any excluded ground. A rectangle is length × width, a circle is π × radius², and a triangle is base × perpendicular height ÷ 2. A tree ring is the outer circle minus the trunk-clear circle. If you already know the area, enter it in square feet or square meters. Parts must not overlap. Volume is area × depth in the same units. The calculator converts every measurement to the same unit before working out volume: 1 cubic foot is 1,728 cubic inches and 1 cubic yard is 27 cubic feet.
Extra material increases the order, not the space you measured. Bags, rolls, pallets and pavers round up to whole units. If the unrounded amount fills an exact number of bags, rolls, pallets or pavers, the calculator keeps that exact whole-unit count. The screen shortens long decimals for reading, but the whole-unit order uses the full amount. If shortening a number would make the bag or piece count look wrong, the result says “just over” or “just under” the rounded amount. The starting numbers only show how the calculator works. Replace them with your measurements and the size printed on the product you plan to buy.
Gravel weight is cubic yards × pounds per cubic yard, divided by 2,000 for US short tons. The pea-gravel example uses South Bay Materials’ stated 2,440 lb per cubic yard for its 3/8-inch product. The Sakrete example is derived from 60 lb for approximately 0.6 cubic feet: 2,700 lb per cubic yard. Neither establishes the density of every material with the same name. Moisture, grading and how the stone is packed matter; use your supplier’s figure and compaction allowance for the actual order.
Sod uses the stated area per roll or pallet. Pavers use either face area or the maker’s stated pieces per square foot. Cutting allowance applies only to the surface pieces; base and bedding remain separate measured layers before any supplier allowance. Polymeric jointing sand is counted in bags from the paved area and the area one bag covers, as the maker prints it; the volume of the joints themselves and mixed-size pack layouts are not calculated.
The example mulch and topsoil calculation is 20 × 10 ft at 3 in deep: 50 cubic feet, 50 ÷ 27 cubic yards, or 25 bags of 2 cubic feet. The raised-bed worksheet starts with an 8 × 4 ft interior filled 12 in deep, giving 32 cubic feet. These are arithmetic scenarios. The sod example’s 5-square-foot rolls and 450-square-foot pallet are published sizes, but not universal ones. Example pavers are 12 × 12 inches, giving 1 square foot each before joints. Change the sample measurements to your actual job.
The publishers behind these example figures are listed, each with a link to its page, on the Sources page linked at the foot of every page.