From the box label.
Plank flooring is sold by the box, and each product lists coverage per box. Measure the room, add waste for end cuts, and divide by the box coverage. For L-shaped rooms, split the room into rectangles and add them in the square footage calculator first.
Before you install
- Check that the room is square: measure both diagonals. A room that is out of square needs the first row scribed to the wall, not set tight against it.
- Leave the expansion gap the manufacturer specifies at every wall, usually 1/4–1/2" (6–12 mm).
- Stagger end joints by at least 6–12" (150–300 mm) between rows.
Frequently asked questions
How much waste for flooring?
Use 5–10% for straight installs in simple rooms and 15% for diagonal installs or rooms with many corners.
Do I need underlayment?
Most laminate and many floating floors require it unless the planks have it pre-attached. Glue-down and nail-down floors use different preparation.
Results are planning estimates. For structural work, confirm requirements with your local building authority and a qualified professional. See our disclaimer.