What :
Riser – A stair riser is the vertical space between one step and another. It may be closed or open, depending on the style of the stairs.
Trade – A stair tread is the horizontal part of the step that a person will stand on, and along with the riser, is an integral part of a staircase.
How :
Choose a stair rise somewhere between 7 and 7-1/2 inches. Take your total height divided by that stair rise number. This will almost always give you a long decimal number. Round to the nearest whole number – this will be the number of steps you will have in your staircase.
