Guessing how much flooring to buy wastes money in both directions — too little stalls the job, too much burns budget. Enter your room size below and this free calculator gives you the square footage to order, the number of boxes, and the material cost.
How much flooring do you need?
Enter your room size to get the exact square footage to order, the number of boxes, and the material cost.
Your estimate
Material cost only — installation labor, underlayment and trim are extra. Waste of 10% suits straight layouts; use 15% for diagonal and 15–20% for herringbone patterns. Always round up to full boxes and keep one spare box for future repairs.
How to use this flooring calculator
- Measure your room's length and width (for L-shaped rooms, split the room into rectangles and run the calculator for each).
- Pick your flooring type — the average material price fills in automatically, and you can adjust it.
- Check the coverage per box on the product you are buying and enter it.
- Keep the waste allowance at 10% for straight layouts, 15% for diagonal, up to 20% for herringbone.
How we calculate flooring
Room area = length × width. We add your waste allowance for cuts, mistakes and future repairs, then divide by the box coverage and round up to whole boxes — flooring is only sold in full boxes. Material cost = order amount × price per square foot. Installation labor is not included; pros typically charge an additional $2–$6 per sq ft depending on the material.
Waste allowance guide
| Straight layout, simple room | 5–10% |
| Room with many angles or obstacles | 10–15% |
| Diagonal layout | 15% |
| Herringbone or chevron | 15–20% |
Flooring calculator FAQs
How much flooring do I need for a 12×12 room?
A 12×12 room is 144 sq ft. With the standard 10% waste allowance you should order about 159 sq ft — that is 8 boxes at 20 sq ft per box. Use the calculator above for your exact room.
Why do I need to order extra flooring?
Boards and planks get cut at walls and around obstacles, some pieces get damaged, and dye lots change between production runs — running short mid-job can mean a visible mismatch. The waste allowance covers cuts and leaves you spares for future repairs.
How many boxes of flooring do I need?
Divide the order amount (area plus waste) by the coverage printed on the box — commonly around 20 sq ft — and round up. Example: 159 sq ft ÷ 20 = 7.95, so 8 boxes.
Does this calculator include installation cost?
No — it estimates material only. Professional installation usually adds $2–$6 per sq ft depending on the material, subfloor condition and your region.