To calculate the number of rises required for a staircase, start by dividing the total rise height by the target rise hight. The Chippy Tools calculator starts by taking this result removing decimal places. Chippy Tools will then calculate the required rise height with this number of rises, by diving the total height by the number of rises, ensuring that the the rise height does not exceed the maximum allowed rise height and is not less than the minimum allowed rise height. If the result of this is outside the allowed parameters the Chippy Tools stair calculator will then recalculate adding one to the number of rises. The maximum and minimum heigh will likely differ based on local building codes, by region around the world. It is your responsibly to ensure the output provided by Chippy Tools meets all building codes. The target height, maximum height and minimum height used might vary depending on the where in the wold you were taught, by default Chippy Tools stair calculator will use a target height of 180 millimetres or 7 ³/₃₂ inches; maximum height of 190 millimetres or 7 ⁷/₁₆ inches; and a minimum height of 130 millimetres or 5 ¹/₈ inches.