Estimate bricks, cement, sand and total cost for any wall — with door and window deduction, common wall size presets, and a Katha/Bigha/Decimal/Cent area converter.
Katha/Bigha shown here use the common West Bengal & Bangladesh standard (1 Bigha = 14,400 sq ft = 20 Katha). Bigha varies by state — for Bihar, UP, Rajasthan and other regions, use the Land Area Converter instead. Decimal and Cent are the same unit (1/100 Acre) used under different regional names — Decimal in Bihar/Odisha/West Bengal, Cent in Kerala/Tamil Nadu.
| Scenario | Wall Area | Approx. Bricks (9-in wall, standard brick, 5% wastage) |
|---|---|---|
| 100 sq ft wall | 100 sq ft | ~957 bricks |
| 500 sq ft wall | 500 sq ft | ~4,785 bricks |
| 1,000 sq ft house (all walls) | ~1,000 sq ft equiv. | ~8,000–10,000 bricks* |
| 9-inch wall, per sq ft | 1 sq ft | ~9.6 bricks |
| 4.5-inch (half brick) wall, per sq ft | 1 sq ft | ~5.0 bricks |
*Whole-house estimates vary widely with number of floors, wall height, and openings — use the calculator above with your actual wall dimensions for an accurate figure.
Estimating bricks for a wall comes down to comparing two volumes: the total volume of the wall you're building (after subtracting doors and windows), and the volume that a single brick occupies once you account for the mortar joint around it. Divide the first by the second, and you get the number of bricks required before wastage.
Net wall area = Gross area (Length × Height) − total door/window opening area. Wall volume = Net area × Thickness. Brick-with-mortar volume = (brick length + joint) × (brick width + joint) × (brick height + joint). Number of bricks = Wall volume ÷ Brick-with-mortar volume, increased by the wastage percentage.
A wall with even a single standard door (about 21 sq ft) and one window (about 12 sq ft) can have 15-20% less actual brick area than its gross dimensions suggest. Skipping this deduction is one of the most common reasons site estimates overshoot — ordering bricks for openings that will never be filled.
Once the brick count is known, the difference between the total wall volume and the volume actually occupied by bricks (without their surrounding mortar) gives the wet mortar volume. This is inflated by a standard 1.33 dry-volume factor to account for the volume lost when dry cement and sand are mixed with water, then split according to the mix ratio — commonly 1:6 (cement:sand) for general brickwork, or a richer 1:4 for load-bearing walls. Cement volume is converted to bags using the standard figure of 1.226 cubic feet per 50kg bag.
Traditional Indian bricks (9 × 4.5 × 3 inches) remain common in many regions, while the Bureau of Indian Standards modular brick (19 × 9 × 9 cm) aligns brickwork to a consistent metric grid. Modular bricks are typically smaller, so more are needed to fill the same wall area.
Wall thickness isn't just a cost decision — it affects structural load-bearing capacity, sound insulation, and how much usable floor area a room loses to its walls. Choosing the right thickness for each wall type avoids both over-building (wasted material and cost) and under-building (a wall that can't safely carry the load placed on it).
Used almost exclusively for internal partition walls that don't carry structural load — separating rooms within a floor. They use roughly half the bricks of a full 9-inch wall for the same area, but should never be used for external or load-bearing walls.
The standard choice for external walls and load-bearing internal walls in most residential construction across India. It offers a reasonable balance of structural strength, thermal insulation, and material cost, and is what most contractors default to unless a structural engineer specifies otherwise.
Used where extra load-bearing capacity is needed — typically ground-floor walls in multi-storey buildings, boundary walls exposed to significant lateral pressure, or in regions with stricter thermal or acoustic requirements. It roughly triples the brick and mortar requirement compared to a half-brick wall for the same area.
The 5-10% wastage this calculator applies is an estimate, not a guarantee — actual wastage on a real construction site depends heavily on handling practices, and a few common-sense steps can bring it down toward the lower end of that range.
Brick prices vary significantly by region, brick type, and whether they're sourced locally or transported — so the cost estimate this calculator produces is only as accurate as the per-brick price you enter. A few things to keep in mind when budgeting a real project.
Transport cost from the brick kiln or supplier to your site can add a meaningful amount per brick, especially for large quantities or longer distances — always ask for a price that includes delivery to compare suppliers fairly.
This calculator's cost estimate covers bricks alone. A full brickwork budget should also account for cement and sand (shown separately above), mason labour charges — typically quoted per thousand bricks laid or per square foot — and any scaffolding needed for taller walls.
Fly ash bricks and Autoclaved Aerated Concrete (AAC) blocks are increasingly used as alternatives to traditional clay bricks in Indian construction, often at a comparable or lower delivered cost per square foot of wall once labour and mortar savings are factored in, since larger AAC blocks need less mortar and fewer units per wall. This calculator's brick-size logic is built around standard and modular clay brick dimensions; for AAC blocks, the much larger unit size means a different set of calculations would apply.
For a full house rather than a single wall, the most reliable approach is to run this calculator separately for each wall — entering that wall's own length, height, thickness, and openings — rather than trying to estimate the whole house from one combined number. Room-by-room estimation naturally accounts for the fact that different walls often have different thicknesses (external load-bearing walls at 9 inches, internal partitions at 4.5 inches) and very different numbers of doors and windows.
Once each wall's brick, cement, and sand figures are calculated, simply add up the totals across all walls for the whole-house material list. This also makes it easier to catch a design change later — if one wall's dimensions shift, only that wall's numbers need to be recalculated rather than the entire house estimate.
Construction estimates often start from a plot size quoted in a traditional unit rather than square feet, especially in eastern India and Bangladesh. This calculator's Area Converter tab includes these alongside the standard metric and imperial units.
In West Bengal and Bangladesh, 1 Bigha is commonly 14,400 sq ft, divided into 20 Katha of 720 sq ft each. These values shift meaningfully in other states — Bihar and Uttar Pradesh use a much larger Bigha of roughly 27,000+ sq ft — so always confirm the regional value for legal or transaction purposes using the dedicated Land Area Converter.
Decimal and Cent both refer to the same unit — one-hundredth of an Acre, or 435.6 sq ft — just under different regional names. "Decimal" is the common term in Bihar, Odisha, Jharkhand and parts of West Bengal, while "Cent" is used in Kerala, Tamil Nadu and other southern states for the identical measurement.
For a standard 9-inch (full brick) wall using standard Indian bricks with a 10mm mortar joint, roughly 950 to 1,000 bricks are typically needed per 100 sq ft, including a small wastage allowance.
A rough early-estimation rule is 8 to 10 bricks per square foot of built-up area, so a 1000 sq ft house might need approximately 8,000 to 10,000 bricks — but this varies with wall height, floors, and openings, so a detailed calculation is more reliable.
The traditional Indian brick size is about 9 × 4.5 × 3 inches, while the BIS modular brick is 19 × 9 × 9 cm.
A wastage allowance of 5% to 10% is standard practice to cover breakage during transport, cutting at corners and openings, and site handling losses.
Yes — add each door or window opening with its width and height, and the calculator automatically subtracts that area from the gross wall area for an accurate brick count.
1:6 (cement:sand) is the most common ratio for general brickwork mortar in residential construction; a richer 1:4 mix is sometimes used for load-bearing or exposed brickwork.
Yes — both equal 1/100th of an Acre (435.6 sq ft). "Decimal" is the common term in Bihar, Odisha and West Bengal, while "Cent" is used in Kerala and Tamil Nadu for the identical measurement.
Both are common alternatives worth comparing for cost and speed of construction. AAC blocks in particular need far fewer units per wall due to their larger size, which can reduce labour and mortar costs even if the material's per-unit price looks higher at first glance.
Small differences usually come from real-world variables the calculator can't see directly — actual brick size varying slightly from the nominal dimensions you selected, a mason using a different mortar joint thickness than entered, or on-site breakage exceeding the wastage percentage you applied.