Amount of the concrete is very important to be correctly estimated. Estimation of the quantity of the concrete should be done in the early stages of the design process. For that purpose, there are simple explanations for the formulas and mathematical calculations. First of all, you should know the height of the staircase. Second, you should know the risers and threads. Afterwards, the hypotenuse and the details for the waist (thickness and length). After finding out all of these information, you should enter the values in the formula that is presented in the picture and the tutorial. 
Amount of Concrete in Staircase
At last, see the video and check the link underneath it.
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