How to Determine How Many Carpet Tiles Are Needed

Carpet tiles can be a fun and inexpensive way to add a bit of “pop” to an otherwise bare floor space and can be a lifesaver in high-traffic areas and areas where children and pets congregate.
A main reason for the “lifesaving” feature is they are not only easy to install, but easy to replace. Most carpet tiles are a standard 18 by 18 inches and are easy to cut when creating a design pattern or fitting around doors or baseboards. Determining how many carpet tiles you need requires little more than a tape measure and your design plan.

Step 1

Take measurements of the room, or area of the room, in which you will be working. If the room is an odd shape, such as a room with a nook, divide the room and measure sections separately. This is necessary to complete your design plan. Measure both the length and width of the room, or area of the room, and record your measurements by drawing the room out on graph paper.

Step 2

Complete a design plan. This is only necessary if you want to create a design with your carpet tiles that uses more than one color or shape. Use the diagram you created on graph paper to create the design for the area the carpet tiles will cover.

Step 3

Determine total square footage of the room by multiplying room length by room width. For example, a room that measure 9 by 11 is 99 square feet.

Step 4

Determine square footage of an individual carpet tile. While the standard carpet tile size is 18 by 18 inches, you may find other sizes as well. To determine square footage, multiply the length by the width of the tile and divide the total by 144. For example, if a carpet tile is 18 by 18 inches, the tile is 2 1/4 square feet. If the carpet tile is 24 by 24 inches, the tile is 4 square feet.

Step 5

Calculate how many carpet tiles you need. Divide the total square feet of the room, or area of the room, by the square feet of one carpet tile to determine how many carpet tiles you need. For example, if the room is 99 square feet and the carpet tile is 18 by 18 inches, or 2 1/4 square feet, you need 44 carpet tiles, and if the carpet tile is 24 by 24 inches, or 4 square feet, you need 25 carpet tiles. If you are using more than one color, use your design plan to decide how many tiles of each color you need.

Things You Will Need

  • Graph paper
  • Pencil
  • Tape measure
  • Calculator


  • It is a good idea to add at least 10 percent to the number of carpet tiles so you will have extras on hand in case of errors in installation or to replace tiles as needed.


  • When installing carpet tiles, make sure the pile points in the same direction to ensure the tile does not have a color mismatch.

About the Author

Based in Green Bay, Wisc., Jackie Lohrey has been writing professionally since 2009. In addition to writing web content and training manuals for small business clients and nonprofit organizations, including ERA Realtors and the Bay Area Humane Society, Lohrey also works as a finance data analyst for a global business outsourcing company.