Counting bricks starts with the wall area, but the answer can change before you reach the checkout. Brick size, mortar joints, wall construction and pack quantities all affect the order. A figure labelled “bricks per square foot” is useful only when it matches the brickwork you plan to build.
To estimate bricks, calculate the net wall area, multiply by a verified brick coverage rate and the number of brick layers, then add your cutting allowance and round up. Estimate special shapes and mortar separately using the actual products and wall details.
The MyDIYCalc brick calculator provides a quick comparison. Below, we explain its current assumptions, show how to check a rate and work through a complete example.
Quick answer: how many bricks for a 10 × 3 ft wall?
The wall face is 30 sq ft. For one brick layer at an assumed rate of 6.75 bricks per sq ft, a 10% allowance gives 30 × 6.75 × 1.10 = 222.75, rounded up to 223 bricks.
That answer is conditional on the coverage rate. The current MyDIYCalc option labelled “Standard modular” uses 6.55 instead, so it returns 217 bricks for the same dimensions and allowance. Confirm the rate for your selected product before treating either number as an order.
This guide estimates quantities. It does not determine a safe wall height, foundation, reinforcement, ties or retaining-wall design.
Measure the net area of brickwork
For a rectangular section, multiply length by height. Add separate sections for a stepped wall, and avoid counting overlapping corners twice. Keep measurements in feet when using the calculator’s inputs.
Subtract openings from the wall face, then account separately for the brickwork around them. For example, a 12 × 8 ft face has 96 sq ft of gross area. A 3 × 4 ft opening removes 12 sq ft, leaving 84 sq ft of net face area.
The opening may still require returns, sills, arches or special units. Subtracting its face area does not count those details or specify its support.
The current tool has no door or window deduction field. For a wall with openings, calculate the net-area takeoff separately or split the remaining brickwork into suitable rectangles. Do not enter the full face dimensions and assume openings will be removed automatically.
For a triangular section, its face area is base × height ÷ 2. Add that area to any rectangular portion below it. The tool itself accepts a rectangle, so a shaped wall needs that extra working outside the form.
Verify the brick rate before using a name such as “modular”
The Brick Industry Association’s dimensioning and estimating guide distinguishes brick sizes and their estimating assumptions. Table 4 lists 675 modular bricks per 100 sq ft under its nominal-dimension assumptions, while its non-modular standard-size entry lists 655 per 100 sq ft.
Those become rates of 6.75 and 6.55 respectively. The table estimates exclude waste and require the relevant construction corrections. A size name on its own is not enough to select a rate.
MyDIYCalc currently labels its 6.55 preset “Standard modular,” although the referenced guide separates standard and modular entries. Treat the numeric preset as a software assumption. The other dropdown labels also need checking against your actual product; do not choose a different name merely because its result looks convenient.
Ask the supplier for the brick’s specified length, face height, intended joint thickness and coverage for the proposed bond. Also confirm whether the quoted coverage already includes waste.
Check a face-area rate from brick and joint dimensions
For a simple repeating stretcher layout, an approximate rate can be calculated from the brick’s visible face and the joints:
Bricks per sq ft ≈ 144 ÷ [(brick length + vertical joint) × (brick face height + horizontal joint)]. All four dimensions inside the brackets must be in inches.
As a dimension-specific example, take a brick face measuring 7⅝ inches long by 2¼ inches high, with ⅜ inch joints in both directions. These face dimensions are listed for modular products by General Shale, including its STEEL product listing.
- Horizontal module: 7⅝ + ⅜ = 8 inches.
- Vertical module: 2¼ + ⅜ = 2⅝ inches.
- Repeating face module: 8 × 2⅝ = 21 sq in.
- Rate: 144 ÷ 21 = 6.857… bricks per sq ft.
That is about 6.86 for these dimensions, rather than a universal rate for everything sold as modular brick. For the 30 sq ft example with 10% added, the unrounded dimension-based calculation gives 226.285… bricks, rounded up to 227.
This face-area method is an approximation for a repeating layout. Actual courses, ends, corners and cuts still need a layout check. If the supplier provides an applicable takeoff rate, understand its assumptions rather than averaging it with another method.
If you already have nominal module dimensions that include joints, do not add the joints again. If measurements are in millimeters, calculate pieces per square meter with 1,000,000 in the numerator and millimeter dimensions throughout; do not mix that rate with a wall area in square feet.
Worked example: what the current MyDIYCalc tool returns
Enter a 10 ft length, 3 ft height, the 6.55 preset, single skin and 10% waste. The software calculates:
Brick order = round up [10 × 3 × 6.55 × 1 × 1.10] = 217 bricks.
It then estimates mortar by dividing that rounded order by 37 and rounding up, giving 6 bags of 80 lb. Its pallet comparison divides 217 by an assumed 500 bricks per pallet and displays 0.4 pallets.
The arithmetic matches the tool. The brick-rate label, mortar yield and pallet size still need product checks. In particular, 0.4 pallets is a rounded comparison: 0.4 × 500 is only 200 bricks, so it cannot replace the 217-brick order.
| Rate used for one layer | 30 sq ft with 10% added | Rounded bricks |
|---|---|---|
| 6.55: current tool preset | 216.15 | 217 |
| 6.75: referenced modular table assumption | 222.75 | 223 |
| 144 ÷ 21: dimension-specific example | 226.285… | 227 |
These are different assumptions, not three interchangeable buying recommendations. The current tool does not accept a custom brick size, custom rate or joint thickness. Use a manual calculation or supplier takeoff when its presets do not match.
Apply thickness, bond and waste in the right places
The tool’s double-skin option multiplies its area-based brick count by two. At the same 30 sq ft, 6.55 rate and 10% allowance, it gives 433 bricks: 30 × 6.55 × 2 × 1.10 = 432.3, rounded up.
This multiplier does not establish how a wall should be built. A wall with a brick outer leaf and a block inner leaf is not an order for two identical brick layers. Likewise, piers, returns, caps, headers and special bond details need their own takeoff.
Use the bond and thickness from the project design. An area estimate alone cannot determine structural suitability, and selecting double skin is not a substitute for that design.
The 10% used here is an example allowance. Agree the actual percentage for cuts, breakage and the layout. Add it once to the applicable base requirement, then round at the end. Keep separately specified special units on separate order lines so a general allowance does not accidentally replace them.
Estimate mortar from the selected product
The current calculator’s one-bag-per-37-bricks allowance resembles a published product yield: QUIKRETE Mortar Mix No. 1102 states that an 80 lb bag can lay up to 37 standard bricks. That is a named product’s stated yield, not a promise for every brick, joint or mortar.
The software applies its divisor to the brick order including waste. Some of those bricks may never be laid, so its mortar result is a broad purchasing allowance rather than a measurement of the joints in the finished wall.
For an illustrative 223-brick requirement at a suitable product yield of 37 bricks per bag, 223 ÷ 37 = 6.027… bags, rounded up to 7. Check whether the product’s conditions and the count used are appropriate before relying on that figure.
Joint dimensions, brick geometry, bedding, wall details and handling losses can change actual mortar use. Mortar selection also belongs to the specified construction; this quantity guide does not select a mortar type.
Distinguish an 80 lb bag of complete sanded mortar mix from a bag of masonry cement that needs separate sand. Their bag counts are not interchangeable. Repointing, thin brick and paving installations need their own product coverage methods.
Convert the checked count into packs
Ask for the actual pieces per pack and whether split packs are sold. For a 223-brick target, the following illustrates whole-pack rounding:
| Hypothetical pack size | Whole packs needed | Bricks supplied |
|---|---|---|
| 100 | 3 | 300 |
| 250 | 1 | 250 |
| 500 | 1 | 500 |
These are example pack sizes, not supplier listings. Compare the delivered total and any split-pack terms before ordering. Keep the brick code, size, finish and special shapes on the quote so another product is not substituted solely because it has a similar name.
Record the net area, verified rate, waste allowance, mortar product and pack rounding in your project materials checklist.
Foundations are a separate quantity. Once their dimensions have been specified, our concrete bag buying guide explains the volume-to-package calculation. It does not determine the foundation design.
Brick quantity FAQs
How many bricks do I need per square foot?
Use a rate matched to the actual brick, joints and bond. This guide shows why the tool’s 6.55 preset, a 6.75 table assumption and a 6.857… dimension-based example can differ. None should be applied to every product labelled “standard.”
Do I subtract doors and windows?
Subtract their face area in the takeoff, then count returns, sills and other details separately. The current calculator has no opening fields, so it does not perform that deduction for you.
Does the brick rate already include mortar joints?
An applicable brickwork coverage rate normally describes the chosen brick-and-joint arrangement. Check how it was defined. Add joints when deriving a rate from bare face dimensions; avoid adding them again to nominal module dimensions that already include them.
Does double skin mean I should buy twice the calculator’s single-skin result?
The software doubles its unrounded base requirement before waste and final rounding. Doubling an already rounded single-skin result can differ by a brick. More importantly, the actual wall layers and bond must match the design.
How many mortar bags do I need for 1,000 bricks?
The tool’s fixed divisor gives 1,000 ÷ 37 = 27.027… bags, rounded up to 28 bags of 80 lb. This is a software allowance using that yield assumption, not a universal mortar order. Confirm the selected complete mix, brickwork and any waste provision.
Can I use this for a patio or retaining wall?
Do not transfer a wall-face rate directly to paving laid on a different brick face. Retaining and structural walls also need project-specific design and a complete material takeoff; the calculator does not provide those details.
Check the rate, then check the order
Keep the selected brick dimensions and joint assumptions beside your wall measurements. Use the brick and mortar estimator for a preliminary comparison where its numeric preset applies, then confirm the final brick, special-unit and mortar quantities with the supplier or mason.
The building project calculators bring the related material tools together when you are planning the rest of the work.
Calculation note: the tool examples were checked against the supplied MyDIYCalc formula. Industry tables, named manufacturer dimensions and product yield information were reviewed on 26 October 2026. The article identifies the current preset-label mismatch; the calculator software has not been changed by this content package.
