How to calculate bricks for house construction

Plot area

         Exterior wall thickness 9" or 9 inch

         Interior wall thickness 4" or 4 inch
         
         Height of walll   10' or 10 feet 




Step:1
          
             Calculate wall length
           
             9" wall = (40+40+25+25)×10
                           = 1300 sqft

            4" wall  = (40+25)×10
                           = 650 sqft

Step:2

      9" wall required 10 bricks per sqft

      4" wall required 5 bricks per sqft

      Number of bricks = (1300×10)+(650×5)
                                       = 16250 bricks

According to above plan design requirement of bricks 16250 for construction.
https://youtu.be/_w30bFPr4go