Estimating materials starts with simple area division — here the wall area divided by the area each brick covers.
The count is N = A_wall/A_brick. where A_wall is the wall face area and A_brick the area one brick covers.
Divide wall area by brick area.
Round up and add a wastage allowance (typically 5–10%). The brick area includes the mortar joint so the estimate matches real coursing.
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