Unless you have abnormally wide or narrow stairs, they’ll measure close to 3 feet (0. 91 m). If you plan to only install a carpet runner down the center of your stairway, measure the width of the area that you plan to cover. [2] X Research source
So, if the stair width is exactly 36 inches (91 cm), with the added inches, the stair now measures 38 inches (97 cm).
If the tread overhangs the riser, measure back to the riser itself under the overhang and then down to the bottom. You’ll use the total measurement to calculate the height of each stair. Risers are typically around 6–7 inches (15–18 cm) high.
Rounding the measurements up will ensure that you have a little extra carpeting to cover the steps in case any gets thrown away.
As you did for the step measurements, round the landing measurements up to the nearest foot (or to the next 30 cm, if you prefer metric measurements).
If you plan to install carpet padding beneath the carpet on the stairs, add 3 inches (7. 6 cm) to the total area of the stair before rounding.
Keep in mind that the stairs may not all be in 1 row. For example, many homes have 6 stairs, then a small landing, then 6 more stairs.
In our example, your landing measures 4 by 5 feet (1. 2 m × 1. 5 m). Multiply these dimensions to calculate the amount of carpet you’ll need to cover the landing: 20 feet (6. 1 m).
Find a carpet calculator online at: https://www. homeadvisor. com/r/carpet-calculator. For another option in which you’ll only need to input the width and number of your stairs, check out: https://www. improvenet. com/r/carpet-calculator.
In our example, the total stair surface area came to 96 square feet (8. 9 m2). Adding an extra 10% to this estimate gives us a final figure of: 106 square feet (9. 8 m2).
