Calculate the number of bricks needed for a wall, accounting for the mortar joint thickness and a wastage allowance.
Brick Size (mm)
How to Use the Brick Calculator
Enter the "Wall Length", "Wall Height", and "Wall Thickness".
Enter your brick's "Length", "Width", and "Height" - defaults are for a standard modular brick.
Enter the "Mortar Joint" thickness between bricks.
Enter a "Wastage (%)" allowance for broken or cut bricks.
Click "Calculate Bricks" to see the total number of bricks needed.
Frequently Asked Questions
Each brick occupies more space in the wall than its own dimensions once the mortar joint around it is included. This calculator adds the mortar thickness to each brick dimension before computing how many "brick + mortar" units fit into the wall volume.
A 9-inch wall is approximately 230mm thick (one full brick length), while a 4.5-inch (half-brick) wall is approximately 115mm thick - commonly used for partition walls.
No, this calculator assumes a solid wall. Use the Wall Area Calculator to work out the net wall area after deducting doors and windows, then scale down your brick count proportionally.
Yes, it's completely free and requires no sign-up.