Bricks Calculation

Here is the break up formula for numbers of Bricks in 1 cft we use, and also calculations for mortar, because I observe, we studies and many of our friends know that we used 13.5 bricks in 1 cft, but if we found any change of size in bricks then it create problems, for this constant value we are using standard size of Brick (9" X 4.375" X 2.6875"), but many of the areas specially in Pakistan where we can't get this brick with specific size then we have to calculate the actual quantity of brick in 1 cft for particular size. Soft copy of excel sheet is available on request.
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