How to Estimate Bricks and Mortar for a Wall
The Brick Wall and Mortar Bag Calculator is a starting point for a simple brick-faced wall. Begin with an elevation drawing, not a guessed number of bricks per square foot. Mark the wall ends, height changes, doors, windows, corners and any area that will use a different unit or bond. A clean drawing makes both the area deduction and the limits of an area method visible. Keep brick quantity and mortar-bag quantity on separate lines of the worksheet, since their product assumptions differ.
Collect the measurements
Measure the length and height of each rectangular wall face. Multiplying those dimensions in feet gives gross square feet. Measure every major door and window opening in the same units and sum those areas. Subtract the opening total once. Do not deduct a window from the length and then deduct its area again. If the walls have different heights or different brick types, run separate estimates and combine their purchase counts only after checking that the same product can be used in both locations.
Sketch the location of each opening. An area deduction describes a missing region, but it does not predict the number of cut bricks around jambs and sills. Several narrow openings can create more cutting than one broad opening with the same total square footage. That is why the calculator asks for a separate allowance percentage. Select it from your layout and expected breakage; do not treat the starting 10% as a universal rule. The model cannot determine whether offcuts are reusable elsewhere.
Check actual brick size and joint width
Nominal brick names can conceal different actual faces. The modular preset is 7⅝ in long by 2¼ in high. With a ⅜ in mortar joint added in each direction, its wall module is 8 in by 2⅝ in. A standard-face example uses 8 in by 2¼ in, and an engineer modular example uses 7⅝ in by 2¾ in. Manufacturer dimensions should govern the entry for the specific unit being purchased. Keep the laid orientation consistent with the face values; a soldier course, special return or other orientation requires a separate count.
The Brick Industry Association dimensioning note explains modular dimensions and estimating context. The Glen-Gery catalog gives examples of actual brick sizes. Use these as reference points and confirm your supplier's current technical sheet. A single joint width in the calculator is applied to both head and bed joints. If those differ, or if bond geometry is unusual, prepare a detailed takeoff instead of forcing the job into one module.
Run and audit the default example
A wall measuring 20 ft by 8 ft (6.096 m by 2.4384 m) has 160 ft² (14.8645 m²) of gross face. Deduct 16 ft² (1.4864 m²) of openings for 144 ft² (13.3780 m²) net. The modular face plus joints occupies 8 × 2⅝ = 21 square inches (0.01354836 m²), or 21 ÷ 144 = 0.145833 square feet per brick module. The unrounded area count is 144 ÷ 0.145833 = 987.43 bricks. Adding 10% gives 1,086.17, so round up to 1,087 whole bricks. A hand calculator should reproduce the displayed order count. If it does not, check that you entered actual face dimensions in inches and the wall area in square feet.
Estimate mortar with the right product reference
The mortar line divides the rounded brick order by an editable number of bricks laid per bag. A QUIKRETE Mortar Mix technical sheet gives an up-to-37-standard-brick figure for an 80 lb (about 36.29 kg) bag. This is an approximate reference, not a modular-brick guarantee. Joint size, brick geometry, wastage, bag weight and mix can change coverage. Record the exact mortar product, bag size and yield source. At 37 bricks per bag, 1,087 ÷ 37 rounds up to 30 bags. If the correct yield for the job is 30 bricks, the estimate becomes 37 bags without changing the brick count.
Do not infer mortar type or suitability from the bag count. The wall specification must establish material selection and installation details. Mortar yield is a purchasing input, while structural design, anchors, lintels, moisture control, flashing and code matters require separate review. The calculator does not inspect any of those conditions.
Turn the count into an order
Ask whether bricks are sold individually, by cube or by pallet, and whether partial packs are available. Keep the whole-brick count visible even if the final order is rounded to supplier packaging. Confirm color, finish and lot availability; replacement pieces later may not match exactly. Check delivery access, unloading and where the material can be stored dry and safely. Recheck the elevation drawing after any change to openings, wall height or brick selection. The calculation is a transparent face-area estimate to discuss with the mason or supplier, not a construction approval.
Check the elevation against the chosen face
A common takeoff mistake is measuring the whole facade but entering the dimensions of a decorative brick used only above a window. Mark each product and orientation on the elevation, then calculate those regions separately. A second trap is treating a return around a corner as if it were already included in the front face. Label the measured faces explicitly and discuss how corner pieces will be counted with the mason. The simple area model does not resolve that detailing. Keep a separate list of specials, caps and units laid in another orientation so a correct field-brick total does not conceal missing pieces.
Sequence delivery around the masonry work
Confirm the selected product and order quantity before booking delivery, then agree where each lot and mortar product will be placed. Preserve package labels so substitutions can be checked against the approved selection. Ask the supplier how the units and unopened mortar bags should be protected during storage. Arrange access and unloading around the mason's work sequence, and obtain the specified product's weather and installation instructions before fixing the laying date. The estimate supplies quantities; it does not set a curing schedule or authorize work in unsuitable conditions.
Frequently asked ordering questions
Does buying more mortar fix a changed joint width? Recalculate the brick module first, then verify the product-specific mortar yield. Joint width affects the face-area count as well as the separate coverage assumption.
Can leftover cut pieces replace whole bricks in the order? Have the mason identify where those pieces can actually be used before reducing the allowance. An offcut that fits one location may not suit the bond or exposed face elsewhere.