Stair Calculator can be used to find stair rise and run, stair rail angle, stringer length, and other important factors of stair design. Features: - Instant calculation - Result are copy able to other app - Formula are include as reference - Support up to 16 decimal place - Support various unit for each input General guidelines in Stair Design : - Run unit should not be less than 10 inches / 25 cm - Rise unit should not exceed 7 3/4 inches / 20 cm A stairway, staircase, stairwell, flight of stairs, or simply stairs is a construction designed to bridge a large vertical distance by dividing it into smaller vertical distances, called steps. Stairs may be straight, round, or may consist of two or more straight pieces connected at angles. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.