Flooring Calculator

Tell us your room size and we’ll estimate how many boxes of flooring to buy.

Printed on the box — usually 15–30 sq. ft.
%
Typical: 10% (more for diagonal layouts)

Your info stays on your device. We don’t store anything.

How to measure a room

Measure the widest and longest points of the room, including closets, alcoves, and under appliances. For L-shaped rooms, split into rectangles and add the areas.

How we calculated it

Flooring is bought by the box, so we take your floor area (measured or entered directly), add a waste percentage for cuts and mistakes, divide by your box’s coverage, and round up to whole boxes.

Things that can change your result
  • Layout drives waste: straight lays need about 10%, diagonals and herringbone 15% or more.
  • Wide planks and big tiles waste more per cut than narrow ones.
  • Patterned or variable-batch products benefit from an extra box for matching.
Buying tips
  • Buy all boxes from the same lot number — dye lots vary between production runs.
  • Keep a spare box after the job for future repairs; matching discontinued flooring is painful.
  • Boxes list exact coverage on the label — use that number, not the shelf tag.
Common mistakes
  • Skipping closets and doorways.
  • Using 10% waste on a diagonal layout.
  • Buying to the exact square foot — partial boxes aren’t sold.
Frequently asked questions

How many boxes of flooring do I need for a 12×10 room?

That’s 120 sq. ft.; with 10% waste you’re buying for 132. At 20 sq. ft. per box, that’s 7 boxes.

What waste percentage should I use?

10% for a straight lay in a simple room; 15% for diagonal patterns, rooms with many corners, or first-time installs.

Do I subtract for the kitchen island or vanity?

Generally no — flooring usually runs under or gets cut around them, and the offcuts aren’t reusable elsewhere.