Estimation of a staircase with an excel sheet is presented in the tutorial in the video below. The video show the whole process of the calculations of the excel sheets. This staircase has different types of columns, variable and fixed. In both of these types of columns there are different items and different specifications. The numbers and the measurements in the video are presented in inches and feet, and if you want them in other metric system you should only recalculate them. 
Estimation of a Staircase with Excel Sheet
See the tutorial below and then check your own calculations and estimations of staircase.
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