Flooring calculator
Add the right waste allowance and turn square feet into boxes before you buy.
Flooring Calculator
Boxes to buy10
Floor area (sq ft)180
With waste (sq ft)198
Estimated cost$660.00
How it works
- Floor area = length × width.
- Add 10% waste for straight lay, 15% for diagonal or herringbone.
- Boxes = total square feet ÷ coverage per box, rounded up.
Example: A 15 × 12 ft room is 180 sq ft; with 10% waste that's 198 sq ft — 9 boxes at 22 sq ft each.
Frequently asked questions
How much extra flooring should I buy?
10% for standard layouts, 15% for diagonal or patterned layouts and rooms with many corners.
Should I keep spare boxes?
Keep at least one unopened box for future repairs — later batches may not match.
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