Enrichment · Passion Projects · Home and garden

How many boxes
of flooring to buy.

List the rooms by length and width. The calculator adds them up, allows for the waste your laying pattern makes, rounds up to whole boxes and rolls and prices the job.

Count the boxesWhat you get

The flooring calculator

The worked example is made up: two bedrooms, a closet and a hall in straight-laid planks. Nothing you type leaves this browser.

Loading the calculator. If nothing appears, turn on JavaScript.

What you get

Enrichment · Passion ProjectsFree

What you finish with
Floor area, area with waste, boxes and underlayment rolls to buy, the cost and each room’s area. It prints as a shopping summary and downloads as a spreadsheet.
Who it is for
Families planning a flooring project, and students practising area, composite shapes and rounding.
Format
Browser calculator for a phone, tablet or computer, by touch or keyboard. Prints a summary; downloads a spreadsheet (.csv); export and import a file.
Access
Free. No account, no sign-in and nothing to install. Everything you type stays in this browser; nothing is sent to Caveat.
Where it lives
The Passion Projects space in Caveat Enrichment.
Support
Questions, a correction or a request: team@caveatacademic.com.

How to use it

  1. Split the floor into rectangles and measure each.
  2. Enter fixed cut-outs, such as an island, as minus lines.
  3. Choose the laying pattern.
  4. Type the coverage and price from the carton.
  5. Print the summary for the store.

Count the boxes

How the boxes are counted

Rectangles, waste, then whole boxes.

The worked example: two bedrooms, a closet and a hallFloor area367.5 sq ftfour lines addedPlus waste404.3 sq ft+10% straight layBoxes21404.3 ÷ 20.06, round upCost$1,295+ 4 rolls underlaymentThe worked example: two bedrooms, a closet and a hallFloor area367.5 sq ftfour lines addedPlus waste404.3 sq ft+10% straight layBoxes21404.3 ÷ 20.06, round upCost$1,295+ 4 rolls underlayment
Add the rectangles, add the waste for the pattern, then round up to whole boxes.

Composite floors

An L-shaped room is two rectangles; a room with a closet is a rectangle plus a small one. Measure each wall to wall, multiply length by width, and add. A fixed kitchen island or a fireplace hearth is subtracted, which is why the tool accepts a minus sign in front of a length.

Why waste

Every row ends with a cut piece, and some cuts break or show flaws. Installers commonly add about 10 percent for straight lays, 15 for diagonal lays or rooms with many corners, and 20 or more for herringbone. Boxes round up, so you usually end with part of a box spare: keep it for repairs.

Sources

  1. National Wood Flooring Association. Installation guidelines and estimating material (nwfa.org).
  2. U.S. Department of Housing and Urban Development. Rehab guides: floors (huduser.gov).
  3. National Council of Teachers of Mathematics. Area of composite figures in context (nctm.org).
  4. U.S. Environmental Protection Agency. Indoor air quality: flooring and adhesives (epa.gov).

The worked example is made up. Follow the flooring maker’s own waste and acclimation guidance. Your entries stay in this browser. Support: team@caveatacademic.com.