Spiral and Helical Stair Calculator

This staircase calculator features an interactive design that allows you to zoom in and view measurements, select the total rise of the stairs, set the headroom, specify the number of risers and treads, adjust the stringer depth, choose the stair angle, and pick the top connection type (flush tread, half tread, or top tread set down). After making your selections, you can save, print, and export the plan as a PDF.