Our mulch and raised bed soil tools help you measure one or more areas, round to whole bags or an orderable bulk quantity, and compare costs using prices from your own area. The gravel tool accepts dimensions, known cubic yards, or known US short tons and compares orderable supplier quotes. Weight-to-volume conversions require the density of the exact product from your supplier.
We show the conversions and assumptions behind each result so you can check them against a product label, supplier quote, or your own notes. Results are estimates. Site conditions and product coverage can change what you actually need.
How we check the calculations
Project Math Lab maintains the calculators and the worked purchasing examples on this site. Our checks cover unit conversions, added depth, whole-bag rounding, supplier minimums and order increments, missing prices, and gravel density requirements. We also compare numeric-link and API results with the same calculation rules used by the tools.
Our calculation method shows the arithmetic and assumptions. Gardening guidance links to its sources where used; example prices and densities are illustrations rather than local quotes or product recommendations. If you find a discrepancy, report the calculation with the tool, units, and numbers needed to reproduce it.
We're starting with yard materials and will build the next calculators around questions people actually have while buying. If a result looks wrong or a tool would help your project, tell us about it.