Updated June 17, 2026
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To calculate flooring needed: multiply the room length by the width to get square footage, then add 10 percent (or 15 percent for diagonal installs or irregular rooms) to account for cuts and waste. A 12x15 room is 180 square feet, so order at least 198 square feet of flooring material.
Step-by-step flooring calculation
- Measure the room at its widest points, including any alcoves or closets.
- Multiply length by width: a 14x16 room is 224 sq ft.
- Add 10% for straight-lay installs: 224 + 22 = 246 sq ft to order.
- Add 15% for diagonal or herringbone patterns.
- Round up to the nearest full box or bundle your supplier sells.
Waste factor by flooring type
| Material | Waste factor to add | Why |
|---|---|---|
| Laminate (straight lay) | 10% | End cuts, starter row trimming |
| Laminate (diagonal) | 15% | More corner waste |
| Hardwood (solid or engineered) | 10-15% | Grade selection, length matching |
| Luxury vinyl plank (LVP) | 10% | End cuts |
| Carpet | 10-15% | Seam placement, pile direction |
| Tile (straight) | 10% | Border cuts |
| Tile (diagonal or pattern) | 15-20% | More edge waste |
Do not forget transitions and thresholds
Each doorway where flooring meets a different material needs a transition strip. Measure each opening and buy the matching profile (T-molding, reducer, or threshold). This is often overlooked and requires a separate purchase from the flooring itself.
Buying in boxes
Most flooring is sold in boxes that cover a fixed square footage -- check the label. Divide your total needed by the box coverage and round up to the next whole box. Never round down; running out mid-install with a discontinued or dye-lot-specific product is a common and expensive mistake. Use our flooring calculator to get your exact order quantity including waste, or measure your room first if you are not sure of the area.
Multi-room and whole-floor projects
For multiple rooms, calculate each room separately (each has its own waste cuts), then add the totals. Do not simply measure the total floor area of the house and apply one waste factor -- you will under-order. See how to measure square footage for irregular rooms and L-shaped layouts.
Estimate your project
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