Brick and Mortar Calculator

What Is the Brick and Mortar Calculator?

The Brick and Mortar Calculator estimates the number of bricks, mortar volume, and total material cost for walls, patios, and other masonry projects. Enter your wall dimensions, brick size, mortar joint thickness, and waste percentage to get accurate material quantities in seconds.

Brick Types

Different brick types suit different applications. Common clay bricks are the standard choice for most structural walls. Concrete bricks offer consistent color and higher compressive strength. Engineering bricks provide low water absorption for foundations and retaining walls. Fire bricks withstand high temperatures for fireplaces and kilns. Facing bricks have a smooth, finished appearance for visible exterior walls. Each type has unique properties in terms of strength, water resistance, thermal performance, and cost.

Mortar Types

Mortar binds bricks together and transfers loads across the wall. Type M mortar has the highest compressive strength (2500 psi) and is used for heavy-load applications like retaining walls and foundations. Type S mortar (1800 psi) is ideal for structural walls and below-grade applications. Type N mortar (750 psi) is the most common general-purpose choice for above-grade exterior and interior walls. Type O mortar (350 psi) is for non-load-bearing interior work. Mortar mix proportions are typically expressed as parts of cement to lime to sand by volume.

Bond Patterns

The bond pattern determines how bricks are arranged in the wall and affects both appearance and structural performance. The running bond is the simplest and most common pattern, with each row offset by half a brick. The stack bond aligns bricks directly above each other in a grid, creating a modern look but requiring wall ties for structural integrity. The Flemish bond alternates headers and stretchers in each row for a classic decorative appearance. The English bond alternates entire rows of headers and stretchers and offers excellent strength.

Single Wythe vs Double Wythe Walls

A single wythe wall is one brick thick (typically 4 inches for modular bricks) and is used for interior partitions, garden walls, and non-load-bearing applications. A double wythe wall consists of two parallel layers of brick separated by a cavity, providing a total thickness of about 8 inches. Double wythe walls offer greater structural strength, better insulation potential, and improved weather resistance. Cavity walls also allow for drainage and insulation between the wythes.

How Many Bricks Do You Need Per Square Foot?

The number of bricks per square foot depends on the brick dimensions and mortar joint thickness. The formula accounts for the brick face area plus the mortar joint on one side and one end:

Bricks per square foot: $$B = \frac{144}{(L + t)(H + t)}$$

Where $L$ is the brick length in inches, $H$ is the brick height in inches, and $t$ is the mortar joint thickness in inches. For a standard modular brick ($L = 7.625$ in, $H = 2.25$ in) with a $t = 0.375$ in joint:

$$B = \frac{144}{(7.625 + 0.375)(2.25 + 0.375)} = \frac{144}{8.0 \times 2.625} = \frac{144}{21} \approx 6.85$$

This gives approximately 6.85 bricks per square foot, or about 7 bricks per square foot when accounting for waste.

Mortar Volume Estimation

Mortar volume depends on the number of bricks and the joint geometry. For a wall with $N$ bricks, each with bed joint area $A_b$ and head joint area $A_h$, the total mortar volume is:

$$V_m = N \times t \times (A_b + A_h)$$

A good rule of thumb is that each standard brick requires approximately 0.02 cubic feet of mortar (about 6 bags of mortar mix per 1000 bricks for a 3/8 inch joint). Our calculator accounts for your specific brick dimensions and joint thickness for a more precise estimate.

Related Tools

Planning a construction project? You may also find these calculators useful: the Concrete Calculator for estimating concrete volume for slabs and footings, the Fence Calculator for fencing material estimates, and the Tile Calculator for flooring and wall tile quantities.