What this calculator does
Mulch, soil & gravel works out bulk material for a garden bed at a given depth. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaVolume (m³) = area (m²) × depth (mm) / 1000
The inputs explained
| Field | What to enter |
|---|---|
| Bed length (m) | A number, measured in m. Starts at 6. |
| Bed width (m) | A number, measured in m. Starts at 1.5. |
| Depth (mm) | A number, measured in mm. Starts at 75. |
| Price per m³ ($) | A number, measured in your currency. Starts at 65. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with bed length
Every other input is held at the calculator’s starting values while bed length varies. Select any row to load that scenario into the calculator.