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Brick Calculator

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Enter your wall dimensions, brick size, and mortar joint width to find exactly how many bricks you need.

Brick Calculator

Live
Bricks needed
493
Bricks per sq ft
6.16
Add 5-10% extra to this total for cuts, waste, and breakage.

The formula

Effective brick module = (Brick length + joint) x (Brick height + joint) Bricks needed = Wall area (sq in) / Effective brick module
Example

A 10 ft x 8 ft wall, standard bricks (8 x 2.25 in) with a 0.5 in mortar joint: effective module = 8.5 x 2.75 = 23.375 sq in, giving about 6.16 bricks per sq ft, or 493 bricks for the full wall.

Step-by-step guide

  1. Measure your wall's length and height.
  2. Enter your specific brick's dimensions - standard US brick is commonly 8 x 2.25 inches, but modular, queen, and other sizes vary.
  3. Enter your mortar joint width - 3/8 to 1/2 inch is typical.
  4. Add 5-10% extra to the total shown for cuts and breakage.

Brick sizes vary more than you'd expect

"Standard" brick actually refers to a range of similar but not identical sizes depending on region and manufacturer - modular, standard, engineer, closure, king, and queen brick all differ slightly in dimensions. Always confirm the exact size of the specific brick you're buying rather than assuming a generic figure, since even small dimensional differences compound significantly across a large wall.

Common mistakes

Using the brick's raw dimensions without adding the mortar joint - the joint adds real space between each brick that increases the effective size of each "module" in the wall.
Forgetting to subtract door and window openings on a large wall - for a wall with substantial openings, calculate the openings' area separately and subtract it from the total wall area first.

Frequently asked questions

What's a standard mortar joint width?

3/8 inch (0.375) and 1/2 inch (0.5) are both common - check your project specifications or match the joint width of nearby existing brickwork for a consistent look.

Does this account for a double-wythe (two-layer) wall?

No - this calculates a single layer (wythe) of brick. For a double-wythe wall, run the calculation once and then double the result, since the second layer needs the same brick count.

How much mortar do I need, separately from the bricks?

Mortar quantity depends on joint width, brick size, and bed depth - as a rough starting estimate, one 80 lb bag of mortar mix typically lays about 30-35 standard bricks, though this varies by product and technique.

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