🪵 Flooring Calculator
Enter the room's length and width and the square feet in one box (printed on the box). Extra is added for cuts and mistakes.
Flooring to buy
How the Flooring Calculator works
Floor area is length × width. Installers usually add 5–10% for straight layouts and 15% or more for diagonal or herringbone patterns.
Area = Length × Width
Area to buy = Area × (1 + Waste%)
Boxes = ceiling(Area to buy ÷ ft² per box)
Step-by-step calculation
- 1Measure room length and width.
- 2Multiply for square feet.
- 3Add waste.
- 4Divide by square feet per box.
Worked example
A 12 × 14 ft room is 168 ft². With 10% waste you need 184.8 ft², which is 10 boxes of 20 ft² each.
Flooring Calculator examples
| Room length (ft) | Flooring to buy |
|---|---|
| 6 | 92.4 ft² |
| 9 | 138.6 ft² |
| 12 | 184.8 ft² |
| 15 | 231 ft² |
| 18 | 277.2 ft² |
Other inputs kept at the calculator's default values. Results calculated by this calculator.
Why use a Flooring Calculator?
Buy enough flooring with spare boxes for repairs.
Important factors that can affect your results
- Layout pattern (diagonal needs more waste).
- Closets and alcoves.
- Different dye lots between orders.
Frequently asked questions
Should I keep leftover boxes?
Yes — one spare box makes future repairs easy with a matching color.
What about closets?
Measure each extra area separately and add it to the total.
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Last reviewed November 2026 · How we build and check our tools · Report a problem