Measure the wall length, height, and thickness
Calculate wall volume = length × height × thickness
Determine brick size including mortar joint
Calculate volume of one brick with mortar
Divide wall volume by brick volume with mortar
Add 5% to 10% extra for breakage and wastage
Use the formula: Number of bricks = Wall volume ÷ Brick volume with mortar + wastage
For standard modular bricks, use about 500 bricks per cubic meter
For a 4.5-inch wall, use about 50 bricks per square meter
For a 9-inch wall, use about 100 bricks per square meter
Subtract openings like doors and windows before final calculation