Flooring Calculator
Calculate how much hardwood, laminate or vinyl plank flooring you need for a room, including waste.
Free · No sign-up · Runs in your browser · Last reviewed November 2026
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About the Flooring Calculator
This flooring calculator multiplies the room length and width to get the area, adds a waste allowance for cuts and mistakes, and rounds up to whole boxes. It works for hardwood, engineered wood, laminate, vinyl plank and carpet tile. Flooring is sold by the box, so always round up and keep any extra for future repairs.
How to use it
- Enter the room length and width in feet.
- Enter the waste percentage, square feet per box and the price per square foot.
- Press Calculate flooring to see the total, boxes and cost.
Flooring formula
Flooring needed = length × width × (1 + waste). A 14 × 12 ft room is 168 sq ft. With 10% waste you need 185 sq ft, or 10 boxes of 20 sq ft.
Typical waste by layout
| Layout | Waste |
|---|---|
| Straight plank layout | 5% to 10% |
| Diagonal layout | 10% to 15% |
| Herringbone | 15% or more |
| Small or irregular rooms | Add a few percent |
Tips
- Measure each room separately and add them.
- Let flooring acclimate in the room before installing, as the manufacturer directs.
- Do not forget underlayment, trim and transitions.
Flooring estimates: a second example and what to watch
Consider a 16 × 13 ft living room, which is 208 sq ft. With 10% waste you need about 229 sq ft. If a box covers 24 sq ft, that is 9.53 boxes, so buy 10 boxes (240 sq ft). Note that rounding up gives you 11 sq ft more than the calculated total, a useful spare for future repairs.
Common mistakes
- Measuring only the open floor. Include closets, alcoves and doorway thresholds if the flooring continues into them.
- Buying exactly the area. Cuts at walls, end pieces and damaged planks always create waste.
- Skipping acclimation. Wood and some laminates need to sit in the room before installation. Follow the manufacturer's instructions.
- Underestimating add-ons. Underlayment, trim, transition strips and adhesive can add a meaningful amount to the budget.
Spaces that you will tile rather than plank are better handled with the tile calculator.
Frequently asked questions
How much flooring do I need for a 12 by 12 room?
The room is 144 sq ft. With 10% waste buy about 158 sq ft.
How much extra flooring should I buy?
About 10% for most rooms, more for diagonal patterns.
How do I calculate flooring for an L-shaped room?
Split the room into rectangles, calculate each area and add them.
Do closets count?
Yes, include closets if the floor will continue into them.
What does flooring installation cost?
Labor often adds $2 to $8 per square foot depending on material and region.
Do I need to subtract kitchen cabinets from the floor area?
Usually not. Flooring is typically not installed under fixed cabinets, so you can subtract them, but many installers recommend ordering enough for future remodels.
Which direction should planks run?
Planks often run parallel to the longest wall or toward the main light source, but there is no strict rule. On wood subfloors, many manufacturers recommend running boards perpendicular to the joists.
Last reviewed: November 2026.