Measure each rectangular section separately and combine the totals. Package coverage and waste remain editable for the exact material.
01 / Formula
How this is calculated
Packages = ceiling(((length × width − exclusions) × (1 + waste %)) ÷ package coverage)02 / Assumptions
What the estimate assumes
- ✓The measured sections are rectangular.
- ✓Package coverage comes from the selected product.
- ✓Transitions, stairs, wall base and trim are separate.
03 / Worked example
See the math in context
A 12 × 15 ft room is 180 sq ft. With 10% waste, purchase coverage is 198 sq ft; at 22 sq ft per box, that is 9 boxes.
04 / Guidance
Measure connected spaces separately
Closets, alcoves, halls, islands, and angled sections are easier to verify as separate shapes. Add net areas before applying one project allowance.
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.