Topsoil Calculator
Enter the finished coverage dimensions and soil depth. The tool reports order volume and an approximate mass; natural moisture and compaction make delivered quantities variable.
How to use this calculator
Measure each bed or lawn area.
Enter the intended finished topsoil depth.
Review the default 10% allowance and replace density with supplier data when possible.
Formula
Order volume = area × depth × (1 + allowance). Mass = order volume × bulk density.
Worked example
A 10 m × 5 m bed at 0.10 m depth is 5 m³. A 10% allowance produces an order estimate of 5.5 m³.
Assumptions and limits
- Default density is 1,330 kg/m³ and is editable.
- Default extra material is 10%.
- Settling, organic content, and moisture are not modeled.
Sources
- National Institute of Standards and Technology: Circumference, Area and VolumeArea and volume formulas for common geometric shapes. Reviewed 2026-08-14.
- National Institute of Standards and Technology: Unit ConversionExact unit conversion and final-result rounding guidance. Reviewed 2026-08-14.
- Federal Highway Administration: Estimating TablesReference material densities used for planning estimates. Reviewed 2026-08-13.
Related calculators
Verification
How this calculator is checked
Trust comes from reproducible evidence, not model confidence. You can inspect the formula, assumptions, worked example, and cited sources on this page.
- Versioned calculationFormula logic is kept separate from the interface and covered by automated registry and behavior checks.
- Cited evidenceSources linked for independent checking: 3.
- Transparent AI useAI may assist drafting or adversarial review. Agreement between models is not proof, and no human expert review is claimed unless a named reviewer is shown.
Frequently asked questions
Does topsoil settle after placement?
It often does. The allowance can cover some settling, but use a local supplier or landscape specification for critical finished elevations.
Can I use metric and US customary units in the Topsoil Calculator?
Yes. Unit changes convert the same canonical measurement; they do not reinterpret or round your original value.
When does the calculator round?
The calculation keeps full precision internally and rounds only the displayed result. Whole packages are rounded up at the final step.
Last updated 2026-08-25 · 1.0.0 · 1.0.0 · Published by YunFanLabs