Flooring Calculator

A 12 ft x 12 ft room is 144 square feet. With 10% waste that is 158.4 square feet to buy. With planks of 2.5 square feet each you need 64 planks, or 8 boxes at 20 square feet per box.

Buy 10% extra for a straight layout and 15% for a diagonal or herringbone pattern. Keep one spare box after the job for future repairs — flooring shades vary between batches.

Multiply length x width to get the area, then add waste. For example, 12 ft x 12 ft = 144 square feet, and 144 x 1.10 = 158.4 square feet with 10% waste. Divide that by the coverage per box to get the number of boxes.

Either works. Measure length x width for a single rectangular room; use the total area when the floor covers several rooms or an irregular shape — just add the areas together first.