Brick Calculator Tool Online | Comprehensive Brick, Sand, and Cement Calculator for Masonry

For brick masonry estimation, compute net wall volume by subtracting window/door openings from the gross wall volume so material takeoff stays realistic. In feet (ft³/CFT) convert thickness from inches to feet, and in metric (m³) convert thickness from millimeters to meters to keep units consistent. Use these formulas: $$V_{wall(ft^3)}=\Big(L_{ft}H_{ft}\frac{T_{in}}{12}\Big)-\Big(A_{open(ft^2)}\frac{T_{in}}{12}\Big)$$ $$V_{wall(m^3)}=\Big(L_{m}H_{m}\frac{T_{mm}}{1000}\Big)-\Big(A_{open(m^2)}\frac{T_{mm}}{1000}\Big)$$

Brick volume is length × width × thickness, but accurate unit conversion is critical for a construction calculator and brickwork estimate. For inches, divide each dimension by 12 to convert to feet; for millimeters, divide each dimension by 1000 to convert to meters. Use: $$V_{brick(ft^3)}=\Big(\frac{L_{in}}{12}\Big)\Big(\frac{W_{in}}{12}\Big)\Big(\frac{B_{in}}{12}\Big)$$ $$V_{brick(m^3)}=\Big(\frac{L_{mm}}{1000}\Big)\Big(\frac{W_{mm}}{1000}\Big)\Big(\frac{B_{mm}}{1000}\Big)$$

Brick-only volume ignores mortar joints, so it can distort the number of bricks and the mortar, cement, and sand quantities in masonry planning. The brick module method adds joint thickness to brick dimensions, which matches real bricklaying spacing and reduces estimation bias. Use: $$V_{module}=(L_b+J)(W_b+J)(B_b+J)$$

Divide net wall volume by the brick module volume and round up, because bricks are purchased as whole units and brickwork needs practical rounding. This method is more consistent than using random efficiency numbers and better reflects mortar joints and real masonry layout. Use: $$N_{base}=\left\lceil\frac{V_{wall}}{V_{module}}\right\rceil$$

Wastage increases the brick quantity to cover breakage, cutting, transport loss, and imperfect units that happen in real construction work. Typical wastage ranges from 3% to 10% depending on site handling, brick quality, corners, openings, and workmanship. Use: $$N_{total}=\left\lceil N_{base}\left(1+\frac{w}{100}\right)\right\rceil$$

A consistent mortar estimate is net wall volume minus the solid brick volume used, which approximates wet mortar requirement for bricklaying. This adapts naturally to brick size, joint thickness, and wall thickness, so your material estimation stays scalable across projects. Use: $$V_{mortar,wet}=V_{wall}-\left(N_{base}\times V_{brick}\right)$$

Mortar is placed wet but ingredients are measured dry, so a dry conversion factor helps estimate cement and sand more realistically for construction planning. A common approximation is \(F_{dry}\approx1.33\), though it can vary with sand moisture, compaction, and site practice. Use: $$V_{mortar,dry}=V_{mortar,wet}\times F_{dry}$$

For mortar ratio \(C:S\), split dry mortar volume into cement and sand using fraction rules, which is standard in mix design and quantity surveying. This method is consistent for brick masonry, plaster work, and other cement–sand applications where material takeoff matters. Use: $$V_{cement}=V_{mortar,dry}\times\frac{C}{C+S},\quad V_{sand}=V_{mortar,dry}\times\frac{S}{C+S}$$

Convert cement volume into weight using bulk density, then divide by bag weight (commonly 50 kg) to get cement bags for purchasing and site logistics. A practical bulk density is \(\rho_{cement}\approx1440\,kg/m^3\), which works well for estimating in most civil engineering cases. Use: $$Bags=\frac{V_{cement}\times \rho_{cement}}{W_{bag}}$$

Multiply quantities by unit prices to estimate costs quickly, which helps in construction budgeting, BOQ planning, and brickwork procurement. For realistic totals, use bricks with wastage and cement bag count from the ratio-based mortar method. Use: $$Cost_{bricks}=N_{total}\times Price_{brick}$$ $$Cost_{cement}=Bags\times Price_{bag}$$

Openings reduce net wall volume, which reduces bricks, mortar, cement bags, and sand in your construction bill of materials. For best accuracy, combine all openings into a single total opening area and subtract it using the wall volume equation for your unit system. Use: $$V_{open}=A_{open}\times T$$

Typical mortar joint thickness is about 3/8 inch (0.375 in) for imperial projects and about 10 mm for metric projects, but actual values depend on workmanship and brick type. Joint thickness changes brick module volume, so it impacts brick quantity and mortar consumption in real brickwork estimation. Use: $$L_{module}=L_b+J,\quad W_{module}=W_b+J,\quad B_{module}=B_b+J$$

No—multiplying brick quantity by 0.94921875 reduces bricks, so it does not represent wastage, breakage, or construction loss in real masonry work. If you want to model efficiency, do it transparently and never replace wastage with a reduction factor, because it underestimates materials. Correct wastage increases quantity: $$N_{total}=\left\lceil N_{base}\left(1+\frac{w}{100}\right)\right\rceil$$

Unit conversion matters when you use density formulas (cement kg/m³) alongside wall volumes measured in ft³ for brickwork estimation. A practical conversion is \(1\,ft^3=0.0283168466\,m^3\) and \(1\,m^3\approx35.3146667\,ft^3\), which keeps results consistent. Use: $$V_{m^3}=V_{ft^3}\times0.0283168466,\quad V_{ft^3}=V_{m^3}\times35.3146667$$

For accurate results, enter correct wall thickness, total opening area, actual brick size, and a realistic joint thickness used on site by your mason. Choose a reasonable wastage percent and a mortar ratio appropriate for brick masonry (often 1:4, 1:5, or 1:6) for better material takeoff. The overall pipeline is: $$V_{wall}\rightarrow V_{module}\rightarrow N_{base}\rightarrow N_{total}\rightarrow V_{mortar}\rightarrow Bags$$