Flooring Calculator

Calculate how much flooring you need for a room. Enter room dimensions, waste percentage, and optional box coverage to get square footage, square yards, and box count.

ft

Length of the room.

ft

Width of the room.

%

Extra for cuts, defects, mistakes. Default 10%. Diagonal/herringbone: 15%.

sq ft

Optional: check the box label. Common: 18-25 sq ft per box for laminate/vinyl plank.

How this calculator works

This flooring calculator estimates material needed for a rectangular room in three steps:

  1. Room area: room length × room width (in sq ft).
  2. Flooring needed: room area × (1 + waste %). The default 10% covers cuts at doorways, closets, and irregular walls.
  3. Boxes: if you enter coverage per box, the calculator divides total flooring by box coverage and rounds up.

For carpet specifically, use the Carpet Calculator — it accounts for roll width and seam placement that this general calculator does not.

Formula

room_area       = room_length × room_width  (sq ft)
sq_yd           = room_area / 9
flooring_needed = room_area × (1 + waste_pct / 100)
boxes           = ceil(flooring_needed / box_coverage)  [if box_coverage > 0]

Example

For a 12 × 10 ft room with 10% waste and 20 sq ft per box:

  • room_area = 120 sq ft
  • flooring_needed = 120 × 1.10 = 132 sq ft
  • boxes = ceil(132 / 20) = 7 boxes

Important assumptions

  • Default waste 10% for straight-lay installations with moderate cuts.
  • For diagonal or herringbone patterns, increase waste to 15%.
  • For natural stone or large-format tile on uneven subfloor, use 20%.
  • Box coverage varies by manufacturer — always check the box label.
  • This calculator does NOT account for carpet roll width or seam placement. For carpet, use the Carpet Calculator.

FAQ

How much flooring do I need for a 12×12 room?
A 12×12 room is 144 sq ft. With 10% waste, you need 158.4 sq ft of flooring — order 160 sq ft (or 8 boxes at 20 sq ft/box).
How much waste should I add for flooring?
10% for standard straight-lay with rectangular rooms. 15% for diagonal or herringbone patterns. 20% for natural stone or large-format tile on uneven subfloor.
How do I calculate square yards for carpet?
Divide square feet by 9. A 12×12 room (144 sq ft) = 16 sq yd. For carpet specifically, use the Carpet Calculator — it accounts for roll width that this simple conversion does not.
What's the difference between this and the Carpet Calculator?
This Flooring Calculator is general-purpose (hardwood, laminate, vinyl, tile). The Carpet Calculator accounts for carpet roll width (12 or 15 ft) and seam placement, which adds waste that this calculator does not.
How do I measure a room with an L-shape?
Divide it into two rectangles, calculate each separately, and add the results. Use the Square Footage Calculator for multi-section rooms.