Keep full unopened cartons when the return policy permits, and retain compatible material for future plank replacement.
01 / Formula
How this is calculated
Boxes = ceiling(net square feet × (1 + waste %) ÷ square feet per box)02 / Assumptions
What the estimate assumes
- ✓Coverage per box is entered from the product label.
- ✓The floor is measured at installation level.
- ✓Underlayment and trim are separate unless packaged with the product.
03 / Worked example
See the math in context
A 320-sq-ft area with 10% waste requires 352 sq ft. At 23.8 sq ft per carton, purchase 15 cartons.
04 / Guidance
Account for layout
Room shape, plank direction, stagger rules, pattern matching, and unusable offcuts influence waste. Follow the flooring manufacturer’s installation instructions.
Questions
Frequently asked
Why add a waste allowance?+
Cuts, layout, defects, breakage, and future repairs can require more material than the net floor area. Keep the allowance visible and adjust it for the product and pattern.
Should I buy by square foot or by box?+
Calculate square footage first, then divide by the exact coverage printed on the package and round up to whole packages. Use the calculator’s editable package coverage.