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How the Brick Calculator Works
Standard Indian Brick Sizes
The Brick Calculator determines the number of bricks required for any wall, along with the mortar volume and cement and sand needed to lay them. Two brick sizes dominate Indian construction. The traditional non-modular brick measures 230 × 115 × 76 mm (length × width × height), a size inherited from British-era standards and still the most widely available size at brick kilns across India. The Bureau of Indian Standards (BIS) defines this size in IS:1077 as a Class designation based on compressive strength rather than geometry, but 230 × 115 × 76 mm is the near-universal mould size for machine-pressed and hand-moulded clay bricks.
The second common size is the modular brick at 190 × 90 × 90 mm. When a 10 mm mortar joint is added on all faces, the nominal unit becomes exactly 200 × 100 × 100 mm — a convenient one-fifth of a metre in each dimension. Modular bricks simplify coursing calculations and reduce mortar volume slightly, but they remain less common than the non-modular 230 mm brick at most regional kilns. The calculator supports both sizes, plus a custom option for any other brick dimension. If you are using fly ash bricks (IS:12894) or aerated autoclaved concrete (AAC) blocks, use the custom size option with your supplier's specified dimensions.
Mortar Joint and Wastage
A 10 mm mortar bed is the standard joint thickness for brick masonry in India, consistent with IS:2212 (Code of Practice for Brick Work). The mortar volume is the difference between the total wall volume and the total solid brick volume. Calculation: for each nominal brick unit (brick + joint), the mortar volume = nominal unit volume − actual brick volume. Summed over the entire wall, this gives the total mortar needed. For the standard 230 × 115 × 76 mm brick with a 10 mm joint, the nominal unit is 240 × 125 × 86 mm = 0.002580 m³, and the actual brick is 230 × 115 × 76 mm = 0.002013 m³, so mortar per brick = 0.000567 m³ (about 22% of the nominal volume is mortar).
Wastage accounts for bricks that are cut at corners, around window and door openings, and along irregular wall runs. The calculator offers 5%, 10%, and 15% wastage options, as well as a custom percentage. For a straight, simple wall with minimal openings, 5% is sufficient. For walls with multiple openings or decorative coursing, use 10–15%. Wastage is applied to the brick count only, not to the mortar volume, since mortar is mixed on site and leftover material is easily used elsewhere. For AAC block walls, which require thin-bed mortar, see the AAC Block Calculator.
1:6 Mortar Mix for Brickwork
IS:2116 (Specification for Sand for Masonry Mortars) and IS:2212 (Code of Practice for Brick Work) together recommend a 1:6 cement-to-sand mortar mix by volume for general brick masonry in protected or semi-protected conditions. This is a relatively lean mix that provides adequate bond strength while remaining workable and allowing minor differential movement without cracking — important in a country with significant thermal cycling.
The material quantities for 1:6 mortar are calculated from the total mortar volume using the same dry volume factor logic as concrete: dry volume = mortar volume × 1.30 (mortar has a slightly lower compaction factor than concrete because it uses only two components). Cement proportion = 1/7 of the dry volume; sand proportion = 6/7. Using cement bulk density 1440 kg/m³ and sand bulk density 1600 kg/m³, approximately 30 kg of cement (0.6 bags) and 0.19 m³ of sand are needed per 0.1 m³ of mortar. These are the values shown in the calculator's cement bags and sand outputs. For a full concrete material breakdown, use the companion Cement, Sand & Aggregate Calculator.
Brick Calculator Formula
The number of bricks is determined by dividing the wall volume by the volume of one nominal brick unit (actual brick + mortar joint on all faces). Wastage is then added as a percentage of the calculated count.
Nominal brick volume (m³) = (BL + J) × (BW + J) × (BH + J)
Wall volume (m³) = Wall Length × Wall Height × Wall Thickness
Bricks (no wastage) = Wall Volume ÷ Nominal Brick Volume
Bricks (with wastage) = Bricks (no wastage) × (1 + Wastage% ÷ 100)
Where:
- BL, BW, BH = actual brick length, width, height (in metres)
- J = mortar joint thickness (typically 0.010 m = 10 mm)
- Wall Length, Height, Thickness = gross wall dimensions in metres
For example, a wall 4 m long × 3 m high × 0.23 m thick (one brick wall), using 230 × 115 × 76 mm bricks with a 10 mm joint and 10% wastage:
Nominal unit = 0.240 × 0.125 × 0.086 = 0.002580 m³
Wall volume = 4.0 × 3.0 × 0.23 = 2.760 m³
Bricks (no wastage) = 2.760 ÷ 0.002580 = 1,070 bricks
Bricks (with 10% wastage) = 1,070 × 1.10 = 1,177 bricks
Mortar volume = 2.760 − (1,070 × 0.002013) = 2.760 − 2.154 = 0.606 m³
Cement bags (1:6 mortar) = 0.606 × 1.30 × (1/7) ÷ 0.035 ≈ 3.2 bags
Sand = 0.606 × 1.30 × (6/7) × 1600 ≈ 1,083 kg
The calculator handles this automatically — the formula is shown here for transparency.
Bricks per Square Metre Reference Table
The table below shows approximate brick counts per m² of wall face area at different wall thicknesses and brick sizes, excluding wastage. Multiply by your wall area and add the appropriate wastage percentage to get your order quantity.
| Wall type | Brick size | Wall thickness | Bricks / m² (no wastage) | Recommended wastage |
|---|---|---|---|---|
| Half brick (partition) | 230×115×76 mm | 115 mm | ~50 | 5–8% |
| One brick (load-bearing) | 230×115×76 mm | 230 mm | ~100 | 5–8% |
| One-and-half brick | 230×115×76 mm | 345 mm | ~150 | 8–10% |
| Half brick (partition) | Modular 190×90×90 mm | 100 mm | ~53 | 5–8% |
| One brick (load-bearing) | Modular 190×90×90 mm | 190 mm | ~107 | 5–8% |
| Boundary wall | 230×115×76 mm | 230 mm | ~100 | 10% |
Note that a "half brick" wall uses the 115 mm face as the exposed face, placing bricks as stretchers (long face outward). A "one brick" wall alternates stretchers and headers (short face outward) in English Bond or Flemish Bond, giving twice the thickness. For walls requiring higher thermal or acoustic performance, consider hollow clay blocks or AAC blocks — the AAC Block Calculator covers those elements. For the plaster that goes on top of the finished wall, see the Plaster Calculator.
Frequently Asked Questions
For a half-brick wall (115 mm thick) using standard Indian 230×115×76 mm bricks with a 10 mm mortar joint, approximately 50 bricks are needed per m². A full one-brick wall (230 mm thick) requires approximately 100 bricks per m². These figures exclude wastage — add 5–10% for cuts and breakage in typical construction conditions.
Non-modular (traditional) bricks follow the older 230×115×76 mm size, which does not align to a 100 mm grid module. Modular bricks are sized at 190×90×90 mm so that the nominal unit (brick + 10 mm mortar joint on all faces) = 200×100×100 mm — exactly one-fifth of a metre in each dimension. Modular bricks reduce mortar consumption and simplify layout calculations, but non-modular sizes remain more common at most brick kilns across India because of established manufacturing moulds.
IS:2116 recommends 1:6 cement-sand mortar (by volume) for general brick masonry in protected locations — this is the ratio used in this calculator. For external walls or areas with higher moisture exposure, a richer 1:4 or 1:5 mix may be specified to improve durability. Lime-based mortars (1:1:6 cement-lime-sand) are occasionally used for heritage restoration work where some flexibility is needed to accommodate thermal movement.
Yes. Fly ash bricks (IS:12894) are available in the same 230×115×76 mm dimensions as standard clay bricks, so the calculation method is identical. If you are using fly ash bricks of a different size (some manufacturers supply 230×110×70 mm), use the Custom brick size option and enter the exact dimensions. Mortar joint thickness and wastage percentages remain the same as for clay brick masonry.
For straight, simple walls with few openings, 5% wastage is adequate. Allow 10% for walls with multiple door and window openings, curved sections, or corner columns where cutting is frequent. For complex decorative brickwork, corbelling, or ornamental patterns, 15% is appropriate. These figures are built into the calculator's wastage dropdown and are consistent with quantities used in CPWD and PWD schedule-of-rates documents.
The calculator produces exact counts based on nominal brick dimensions (brick size + mortar joint) and the wall volume you enter. Real-site variation arises from dimensional tolerances in hand-moulded bricks (IS:1077 allows ±3 mm on length), mortar joint variation with the mason's skill, and irregular wall surfaces. For orders above 5,000 bricks, verify with the supplier's standard packing unit (typically sold in multiples of 500 or 1,000) and round up accordingly.
IS:1077 classifies common burnt clay bricks into grades from 3.5 to 35 N/mm² based on average compressive strength. Class 3.5 bricks (minimum 3.5 N/mm²) are used for non-load-bearing partition walls. Class 7.5 (minimum 7.5 N/mm²) is the typical specification for load-bearing brick masonry in residential construction. Higher-grade bricks (10–35 N/mm²) are used in multi-storey load-bearing structures and are more common in regions where traditional brick masonry replaces frame construction.
Enter the total perimeter length of the boundary wall as the wall length, the height as the wall height, and select one brick (230 mm) thickness as is standard for most boundary walls. Subtract the area of any gate openings from the wall area if significant. Use 10% wastage for a boundary wall since the exposed top course and corners require extra cutting. This calculator gives you the total brick count, mortar volume, and cement and sand quantities in one step.