Free stair carpet calculator to estimate the carpet area needed for treads and risers, including a practical waste allowance.
Estimate carpet for a straight flight of stairs by entering the number of steps, tread depth, riser height, stair width, and waste allowance. The result covers both horizontal treads and vertical risers.
Use the measurements of the finished surfaces, and add extra waste for patterned carpet, seams, landings, or unusual stair shapes. This estimate does not calculate roll layout or installation labor.
Yes. Each step is modelled as one tread plus one riser, multiplied by the stair width.
Ten percent is a practical starting point for plain carpet. Increase it for patterns, seams, landings, or difficult cuts.
No. Measure each landing separately and add its area to the purchase estimate.