Boxes by coverage
Flooring boxes state their coverage — typically 18–25 sq ft for laminate and LVP. The calculator converts room area to boxes with the standard 10% cutting waste (15% for diagonal installs). Enter your room's length and width, not the flooring's — the flooring size only matters on the box label.
Buy one lot, acclimate, then install
Like tile and brick, flooring varies between manufacturing lots — buy everything from one lot. Let the boxes rest in the room for 48 hours to acclimate to humidity; floating floors installed tight from a cold truck will gap in winter. Underlayment is usually calculated at the same square footage, one roll per area.
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.
- Tile Council of North America — the TCNA Handbook installation methods referenced here.
- Carpet & Rug Institute — carpet installation standards and performance testing.
- US Environmental Protection Agency — volatile organic compound limits for paints and coatings.
Figures, formulas and reference tables last verified: 19 September 2026.