What is the Laminate Flooring Calculator?
This calculator tells you how many boxes of laminate flooring to buy for a room. You enter the room's length and width, a waste allowance to cover cuts and mistakes, and the coverage (square feet) printed on each box. The tool computes the floor area, adds the waste, and rounds up to the next whole box — because you can't buy a fraction of a box.
How to use it
Measure your room in feet and enter the length and width. Choose a waste allowance — 10% is typical for straight-lay installations, while diagonal patterns or rooms with many corners may need 15%. Enter the coverage per box from the product label (often 18–24 sq ft). The result shows the number of boxes plus the underlying areas.
The formula explained
First the room area is length × width. Multiplying by (1 + waste) adds the extra material for offcuts. Dividing by the coverage per box gives the raw box count, and the ceiling function rounds it up so you never come up short.
$$\text{Boxes} = \left\lceil \frac{\text{Length} \times \text{Width} \times \left(1 + \frac{\text{Waste \%}}{100}\right)}{\text{Coverage per Box}} \right\rceil$$For example, a 12 ft × 10 ft room is 120 sq ft. With 10% waste that is 132 sq ft. At 20 sq ft per box that is 6.6 boxes, which rounds up to 7 boxes, covering 140 sq ft.
$$\left\lceil \frac{12 \times 10 \times \left(1 + \frac{10}{100}\right)}{20} \right\rceil = \left\lceil \frac{132}{20} \right\rceil = \lceil 6.6 \rceil = 7$$
FAQ
How much waste should I allow? Use 10% for simple rectangular rooms, and 15% for diagonal layouts or rooms with alcoves and many cuts.
Should I buy an extra box? Keeping one spare box is wise for future repairs and to ensure dye-lot matching, since later batches may differ slightly in shade.
Can I use metric measurements? This tool uses feet and square feet. Convert meters to feet (1 m ≈ 3.281 ft) before entering, or ensure your box coverage is also in square feet.
