Measure the length of one of your stairs, horizontally. Write your measurement down on a piece of paper. This measurement will determine the width of your stair carpet.
Measure the depth of one of your steps, which is the length from the front to the back of the stair. Measure the height of the stair and add it to the depth. Write this total down next to the length. Count the number of stairs in the staircase, excluding any landings.
Multiply the total depth and height of the stairs by the number of stairs in the staircase to determine the length and width of your broadloom carpet. If your staircase includes a landing, measure the length of the landing and add it to your total to determine the total length of carpet needed, including the landing.
Use a carpenter’s square as a straight edge. Cut one continuous length of broadloom carpet, using a utility knife.
Measure the length, height and depth of your steps. Measure any landing separately. Remember that carpet tiles are individual pieces, and you will need a tile to cover the face, or front of the stair, as well as the surface stair itself.
Choose a roll of carpet with an adhesive backing, as this will make precut carpet tiles easier to install.
Cut tiles of carpet for your stairs using a carpenter’s square as a straight edge and a utility knife. Cut two tiles for each stair, one to cover the face, and one to cover the surface of each stair. Cut carpet tiles for landings as well.