The order-desk conversion
This is the calculation behind every call to the mulch pile: area × depth ÷ 12 ÷ 27 = cubic yards. The calculator shows yards and the tonnage at typical material densities, so you can compare a by-the-yard delivery with a by-the-ton quote on equal terms.
Sources and standards
Where these figures come from
Every formula on this page is implemented from the published reference material below. Where a value depends on a regional code, the calculator lets you override it rather than assuming one jurisdiction.
- NIST Office of Weights and Measures — the US customary and SI conversion factors used throughout this tool.
- International Code Council — the International Residential Code and International Building Code.
Figures, formulas and reference tables last verified: 19 September 2026.