Flooring Calculator
Enter your room dimensions and flooring type to calculate square footage, waste-adjusted coverage, and boxes needed.
Room dimensions
Material & layout
Sets recommended waste %
Auto-set by material above
Box size (optional)
Listed on the box label
Results
Sq Ft Needed
—
with waste included
Room Size
—
sq ft (exact)
Waste Added
—
sq ft buffer
Boxes Needed
—
enter box size above
How to Calculate Flooring
Multiply the room length by the width to get square footage. Then add a waste factor to account for cuts, pattern matching, and damaged pieces. Always buy a little more than you need — flooring from different production batches can vary slightly in color and texture.
Formula: Sq Ft Needed = (Length × Width) × (1 + Waste % ÷ 100). Boxes = ⌈Sq Ft Needed ÷ Coverage per Box⌉.
Recommended Waste by Material & Layout
| Material / Layout | Waste % | Why |
|---|---|---|
| Hardwood or LVP — straight | 10% | Minimal cuts, simple pattern |
| Hardwood or LVP — diagonal | 15% | More angled cuts at walls |
| Tile — straight lay | 10% | Standard grid layout |
| Tile — offset / brick | 15% | Half-cuts along edges |
| Tile — diagonal | 20% | Significant corner waste |
| Tile — herringbone | 20% | Complex pattern, high cut rate |
| Carpet | 10% | Roll width may not match room |
Frequently Asked Questions
- How many square feet of flooring do I need for a 12×14 room?
- A 12×14 room is 168 square feet. With a standard 10% waste factor, you would need 185 square feet of flooring. For a diagonal tile or herringbone layout, add 20% and buy 202 square feet.
- Why does layout pattern affect how much flooring I need?
- Diagonal and herringbone layouts require more angled cuts, especially along the perimeter of the room. Those cut-off pieces often can't be reused, so more material ends up as waste compared to a straight lay.
- Should I buy extra flooring beyond the waste factor?
- Yes — buy one extra box if your budget allows and save it. If a plank or tile gets damaged in the future, matching your exact flooring from the same production run is often impossible. Having spares saves a headache.
- How do I find the square footage per box?
- It is printed on the side of every flooring box, usually labeled as "Coverage" or "Area." Common ranges are 15–25 sq ft for tile boxes and 18–30 sq ft for hardwood and LVP planks.