http://www.homebuildingandrepairs.com... Click on this link for more helpful videos about stair building, design and home repairs. I wanted to try and provide you with an easier way to calculate or figure out the individual riser height, along with the horizontal distance for the over all stairway, so that you can figure out whether or not it could actually be built or built safely. Don't forget to visit the website and check out some of our books on stair building.