Stairs Calculator For Carpet . Stairs are considered a specialty installation This is a free online carpet cost calculator that provides an APPROXIMATE cost. Use our carpet calculator to determine how much carpet you need for all rooms & stairs. Measuring and Calculating Carpet for Stairs (Carlos Ortiz) This free stair calculator determines stair parameters such as rise, total run, and angle, stringer length, based on height, run, tread, and The Stair Calculator is an online tool for calculating various parameters involved in the construction of stairs. Refer to the figure adjacent to the calculator as a. Then, use ImproveNet to find local carpet contractors. The carpet on stairs is rarely installed in one single piece, and the calculations require great attention to detail. Calculating how much carpet you need to cover your stairs is one of the most difficult aspects of planning your carpet installation. How to