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Flooring Calculator

Calculate how much flooring to buy for a room, including extra for cuts, and how many boxes that is.

Your numbers

ft
ft
%
sq ft
$

Boxes needed

10

Floor area
180 sq ft
With extra
198 sq ft
Estimated cost
$700.00

Results are estimates for planning. Check important figures with a qualified professional.

Quick answer

The Flooring Calculator shows square footage and boxes of flooring with extra for cuts. How it works: Area = length × width; Boxes = area × (1 + waste) ÷ coverage per box, rounded up. For example, with length of 15 ft, width of 12 ft, and extra for waste of 10 %, the boxes needed is 10.

How to use the Flooring Calculator

  1. Enter length.
  2. Enter width.
  3. Enter extra for waste. Adds a margin for cuts, spills, and uneven ground.
  4. Enter coverage per box.
  5. Enter price per sq ft.
  6. Read boxes needed and the breakdown. Use Share to send the exact numbers, or Print to save a PDF.

How it's calculated

  • Area = length × width
  • Boxes = area × (1 + waste) ÷ coverage per box, rounded up

Worked example

With length of 15 ft, width of 12 ft, extra for waste of 10 %, coverage per box of 20 sq ft, and price per sq ft of $3.50:

Boxes needed: 10. Floor area: 180 sq ft.

Questions people ask

How much extra for flooring?

10% is standard. Use 15% for diagonal layouts or rooms with many corners.