The formula is length × width × height
Volume in cubic feet needs all three dimensions in feet; the calculator also accepts the result and shows the same volume in cubic yards (÷27), cubic meters and cubic inches, so you can talk to the quarry, the plumber and the engineer in their own units.
The units people mix up most
Cubic yards to cubic feet is ÷27 (3 feet per side, cubed) — the conversion behind every bulk material order. Cubic inches to cubic feet is ÷1,728 (12³) — the one that catches appliance and engine specs. The calculator does both instantly.
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.