The instructions on how to use the brick calc are simple to follow.
The first step to decide on the number of bricks you will use up is to consider what surface you want to cover with them. In order to do it by yourself you have to calculate:
The area that a single brick covers (the “depth” of a brick is irrelevant in the calculation).
Size of the mortar joint.
The size of the wall (again, it’s only surface that matters, we don’t care how thick the wall is). You may provide the width and the length OR go straight for the square footage.
The brick calculator will estimate how many bricks you need. What’s more, there is a function which counts the wastage, that means the percentage of the bricks which can be destroyed. As a result, the brick calculator provides you with 2 numbers. The first one tells how many bricks you would need to build a wall of particular dimensions, while the second one shows how many bricks you need while taking into account inevitable wastage.