Flooring Calculator
How many boxes of flooring for your room — from the area, the coverage per box, and a waste allowance.
Your project
Total area: 0 sq ft
Material estimate only — confirm quantities against your own measurements and the product packaging before you buy. Round up and keep a little extra for cuts, waste, and mistakes.
What you need
What to buy
—
Boxes to buy
—
Area + waste
— sq ft
Est. cost
—
Shopping list
- —
We may earn a commission from links to retailers, at no cost to you.
Your inputs are saved in the page link — bookmark or share it.
How we calculate it
boxes = round up( area × (1 + waste) / sq ft per box )
Assumptions & sources
- Square feet per box is printed on the carton and varies by product (~18–30 sq ft) — enter the number for your flooring
- Waste allowance is typically 10%; use ~5% for a simple rectangular room and up to 15% for diagonal or herringbone layouts
- For an L-shaped room, add up the area of each rectangle and enter the total
Formulas reviewed against manufacturer spec sheets and industry standards. Last verified 2026.
How to estimate flooring
Take your room’s square footage, add a waste allowance for cuts, and divide by the coverage printed on each box. Always round up to whole boxes, and buy from the same lot number so colors match.
Tips
- Use the box coverage: Every product lists square feet per box — it varies a lot, so use the real number for your flooring rather than a guess.
- More waste for patterns: Diagonal and herringbone layouts create more offcuts; bump the waste allowance to 15% for those.
- Buy an extra box: Keep a spare box for future repairs — matching a discontinued lot later is nearly impossible.
Common questions
How many boxes of flooring for 200 square feet?
At 20 sq ft per box with a 10% waste allowance, that’s 220 sq ft to cover — 11 boxes. Without waste it’s 10 boxes.
How much waste should I add for flooring?
10% is a good default. Use 5% for a simple rectangular room, and 15% for diagonal or herringbone patterns with more cuts.
Why buy an extra box?
For future repairs. Flooring lots vary slightly in color, and matching a discontinued product later is difficult — a spare box saves you.