TryBuildCalcWall / Masonry Quantity Calculator(Brick, Block, Openings, Mortar & Cost)
Calculate brick or block wall quantity with openings.
🕒 Last updated: August 22, 2026
Inputs
ℹ️Use actual wall thickness from drawings, such as 9 in brickwork or 200 mm blockwork.
ℹ️Use this for similar repeated wall panels.
Material Type & Unit Size
ℹ️Width is the solid unit depth. Wall thickness is entered separately for masonry volume.
ℹ️Typical masonry bed and vertical joint thickness is about 10 mm.
Openings
Add doors, windows, and other openings to deduct from wall area. Quantity should be the total number of that opening in the estimate.
No openings added. The calculator will estimate a solid wall.
Mortar, Wastage & Cost
ℹ️Adds extra mortar for joint filling, workmanship variation, and handling loss.
ℹ️Applies to unit quantity and mortar estimate.
Net wall area is 18.58 m². Plan for 2,231 bricks and 1.182 m³ of mortar after allowances.
Theoretical Bricks
2,124 bricks
Gross Wall Area: 18.58 m²
Opening Area: 0.00 m²
Net Wall Area: 18.58 m²
Wall Volume: 4.248 m³
Wall Thickness: 229 mm
Bricks per m³: 500 bricks/m³
Bricks per m²: 114.3
Method: standard brick density
Recommended Bricks
(Including Wastage)
2,231 bricks
Wastage Quantity: 107 bricks
Mortar Volume: 1.182 m³
Base Mortar: 0.979 m³
Plaster Area: 37.16 m²
Recommended Density: 120.1 bricks/m²
Includes wastage allowance for cutting, breakage, and site handling.
Seeing cracks in an existing masonry wall? Wall Cracks: Causes and Remediation →
Deducting door/window openings from this wall? Size the RCC lintel above each one. Lintel Calculator →
What Is a Wall / Masonry Quantity Calculator?
Whether you are ordering clay bricks by the thousand in India, concrete blocks by the pallet in the US, or AAC blocks by the cubic metre in the UK or Australia, the challenge is the same: your wall dimensions are in metres or feet, but your supplier quotes in units, pallets, or volume. Brick and block sizes also vary by region and manufacturer, so a fixed "bricks per square metre" rule of thumb rarely holds across projects. This calculator bridges that gap.
The Wall / Masonry Quantity Calculator converts wall length, height, and thickness — for brick or block walls, with door and window openings deducted — into the number of masonry units, mortar volume, and plaster area you need to order. It supports both standard modular brick sizes and any custom brick or block dimensions your supplier provides, and estimates material cost when unit and mortar rates are entered.
What makes this calculator different:
Most masonry calculators apply one fixed units-per-square-metre figure regardless of actual brick or block size. This calculator instead uses two methods depending on the input: an empirical bricks-per-m³ density figure for standard modular brick sizes (matching the standalone Brick Calculator so results agree), and a true modular volume calculation — unit size plus mortar joint, divided into wall volume — for any custom brick size or block. It also separates mortar allowance (joint filling and workmanship variation) from general wastage as two distinct factors, rather than folding both into a single percentage, and estimates plaster area for both wall faces alongside the unit and mortar quantities in the same result.
Applicable standards:
- IS 1077:1992 and IS 2185 (Part 3) — India (burnt clay building bricks; AAC block specification)
- BS EN 771-1 / BS EN 771-4 — UK/Europe (specification for clay and AAC masonry units)
- ASTM C216 / ASTM C90 — USA (facing brick; loadbearing concrete masonry units)
- AS/NZS 4455.1 — Australia/New Zealand (masonry units, pavers, and segmental units)
How masonry quantity calculation works
Step 1 - Gross wall area
Step 2 - Opening deduction
Net Wall Area = Gross Wall Area - Total Opening Area
Step 3 - Wall volume
Step 4 - Brick or block quantity
Effective Unit Area = (Unit Length + Mortar Joint) x (Unit Height + Mortar Joint)
Effective Unit Volume = Effective Unit Area x Unit Width
Custom Brick or Block Units = Wall Volume / Effective Unit Volume
For standard brick sizes, the calculator uses the same empirical bricks-per-m³ method as the Brick Calculator so matching wall inputs return matching brick quantities. Custom brick sizes and blocks use the modular volume method.
Step 5 - Mortar and wastage
Final Quantity = Units x (1 + Wastage %)
Step 6 - Plaster area and cost
Material Cost = Final Quantity x Unit Cost
Mortar Cost = Mortar Volume x Mortar Cost Rate
Total Cost = Material Cost + Mortar Cost
Plaster area covers both faces of the net wall area and is a planning value for the follow-up plaster estimate. Unit and mortar cost fields are optional — cost rows are only calculated when at least one rate is entered.
Masonry quantity example
This example uses the active calculator inputs above and follows the same six steps from the formula section. Each table shows the value used, the formula applied, and the result produced.
Input Values Used
| Input | Value | Why it is used |
|---|---|---|
| Wall length x height | 20 ft x 10 ft | Sets the gross wall face area |
| Number of walls | 1 | Multiplies gross area for repeated wall panels |
| Wall thickness | 9 in | Converts net wall area into wall volume |
| Material type & unit size | Brick — 190 x 90 x 90 mm | Sets the solid unit dimensions used per brick |
| Mortar joint thickness | 10 mm | Sets the effective module size used to count units |
| Openings | None (solid wall) | Deducted from gross wall area before unit count |
| Mortar allowance | 15% | Adds extra mortar for joint filling and workmanship |
| Wastage | 5% | Applied to both unit quantity and mortar volume |
Step 1 - Gross wall area
Wall length and height are converted to metres, then multiplied by the number of walls.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Convert length | 20 ft converted to metres | 6.096 m |
| Convert height | 10 ft converted to metres | 3.048 m |
| Gross wall area | 6.096 x 3.048 x 1 | 18.58 m² |
Step 2 - Opening deduction
Each opening's width, height, and quantity are converted to an area and totalled, then subtracted from the gross wall area.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| No openings entered — treated as a solid wall | ||
| Total opening area | Sum of all opening rows | 0.00 m² |
| Net wall area | 18.58 - 0.00 | 18.58 m² |
Step 3 - Wall volume
Net wall area is multiplied by wall thickness to get the total masonry volume to be filled with units and mortar.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Convert wall thickness | 9 in converted to metres | 0.229 m |
| Wall volume | 18.58 x 0.229 | 4.248 m³ |
Step 4 - Brick or block quantity
The entered unit size matches a standard brick size, so quantity is calculated using the empirical bricks-per-m³ method.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Standard brick units | 4.248 x 500 bricks/m³ | 2,124 bricks |
| Rounded up brick count | Rounded up to a whole brick | 2,124 bricks |
Step 5 - Mortar and wastage
Mortar volume is the wall volume left over after the solid brick volume, increased by the mortar allowance and then by wastage. Unit wastage is added on top of the rounded brick count separately.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Base mortar volume | 4.248 - Total Solid Unit Volume | 0.979 m³ |
| Mortar with allowance | 0.979 x (1 + 15% ÷ 100) | 1.126 m³ |
| Final mortar volume | 1.126 x (1 + 5% ÷ 100) | 1.182 m³ |
| Brick wastage quantity | 2,124 x 5% ÷ 100, rounded up | 107 bricks |
| Final recommended quantity | 2,124 + 107 | 2,231 bricks |
Step 6 - Plaster area and cost
Plaster area covers both wall faces. Cost rows only appear when a unit cost or mortar cost rate has been entered.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Plaster area (both faces) | 18.58 x 2 | 37.16 m² |
Therefore, for this wall you need approximately 2,231 bricks and 1.18 m³ of mortar, after mortar allowance and wastage.
Essential Checklist+−
Complete these critical checks before approving the work or proceeding to the next construction stage.
✓Drawings & Wall Dimensions+-
- Wall layout confirmed from approved architectural drawings
- Wall thickness confirmed — 115mm half-brick, 230mm full-brick, or as specified
- Wall height confirmed — storey height minus slab thickness and beam depth
- All door and window openings deducted from gross wall area before estimation
- Load-bearing walls identified — confirmed from structural drawing, not assumed
- Wall set-out confirmed — corners, junctions, and returns checked with square
✓Brick & Block Materials+-
- Brick quality confirmed — IS 1077 standard bricks for residential construction
- Brick count calculated using correct formula — approximately 500 bricks per m³ for 230mm wall
- Bricks soaked in water before laying — minimum 30 minutes immersion
- Brick wastage of 5–10% added before ordering — 5% for standard straight walls, 10% for complex layouts
✓Mortar Mix & Preparation+-
- Mortar mix ratio confirmed for wall type — 1:6 general masonry, 1:4 load-bearing
- Mortar volume calculated correctly — approximately 30% of total wall volume for brick walls
- Mortar consistency correct — holds shape when squeezed, not too wet or too dry
- Mortar used within 30 minutes of mixing — no retempering of stiffened mortar
- Sand for mortar is clean, sharp-grained, and free of clay, silt, and organic matter
- Mortar batched consistently throughout — gauge boxes used, not shovel counts
✓Laying & Bond Pattern+-
- Damp Proof Course (DPC) installed at plinth level before wall is built above
- Correct bond pattern laid — stretcher bond (half-brick), English bond or Flemish bond (full-brick)
- Vertical joints staggered — no continuous vertical joints (straight joints) in any three consecutive courses
- Corners built first and racked back — walls built up from corners toward centre
- Wall checked for plumb every 3–4 courses — spirit level on the wall face
- Each course checked for level — gauge rod used to confirm uniform course heights
- All bed joints and perpend joints fully filled with mortar — no voids or unfilled joints
- Wall ties or toothing provided at junction of new wall with existing wall or column
- Lintels installed over all openings before brickwork continues above
- Maximum daily build height respected — not more than 1.2m (12 courses) per day
✓Curing & Protection+-
- Completed brickwork cured by spraying water — minimum 7 days
- Fresh brickwork protected from heavy rain — top of wall covered overnight
✓Quality & Completion Checks+-
- Completed wall plumb checked — tolerance H/600 or 12mm maximum
- All door and window opening dimensions verified — clear width and height confirmed
Full QC Checklist+−
Verification checklist for brick and block masonry wall construction — covering drawing review, material estimation, mortar mix, brick quality, laying sequence, bond pattern, curing, and common defects. Use the Essential Checklist for critical checks before and during construction; expand to Full QC Checklist for complete quality control.
✓Drawings & Wall Dimensions+-
- Wall layout confirmed from approved architectural drawings
- Wall thickness confirmed — 115mm half-brick, 230mm full-brick, or as specified
- Wall height confirmed — storey height minus slab thickness and beam depth
- All door and window openings deducted from gross wall area before estimation
- Load-bearing walls identified — confirmed from structural drawing, not assumed
- Wall set-out confirmed — corners, junctions, and returns checked with square
- Drawing revision confirmed — latest revision used, especially for opening positions
✓Brick & Block Materials+-
- Brick quality confirmed — IS 1077 standard bricks for residential construction
- Brick count calculated using correct formula — approximately 500 bricks per m³ for 230mm wall
- Bricks soaked in water before laying — minimum 30 minutes immersion
- Brick wastage of 5–10% added before ordering — 5% for standard straight walls, 10% for complex layouts
- All bricks from the same production batch where possible — batch numbers confirmed
- If using fly ash bricks or AAC blocks — strength grade confirmed from test certificate
- Bricks stored on firm ground, stacked in bonds — protected from rain and soil contamination
- Bricks checked for efflorescence — white salt deposits indicate susceptibility to staining
✓Mortar Mix & Preparation+-
- Mortar mix ratio confirmed for wall type — 1:6 general masonry, 1:4 load-bearing
- Mortar volume calculated correctly — approximately 30% of total wall volume for brick walls
- Mortar consistency correct — holds shape when squeezed, not too wet or too dry
- Mortar used within 30 minutes of mixing — no retempering of stiffened mortar
- Sand for mortar is clean, sharp-grained, and free of clay, silt, and organic matter
- Mortar batched consistently throughout — gauge boxes used, not shovel counts
- If plasticiser used — manufacturer's dosage not exceeded; no excess soap or detergent
- Mortar joint thickness maintained at 10mm for brick walls, 2–3mm for AAC blocks
✓Laying & Bond Pattern+-
- Damp Proof Course (DPC) installed at plinth level before wall is built above
- Correct bond pattern laid — stretcher bond (half-brick), English bond or Flemish bond (full-brick)
- Vertical joints staggered — no continuous vertical joints (straight joints) in any three consecutive courses
- Corners built first and racked back — walls built up from corners toward centre
- Wall checked for plumb every 3–4 courses — spirit level on the wall face
- Each course checked for level — gauge rod used to confirm uniform course heights
- All bed joints and perpend joints fully filled with mortar — no voids or unfilled joints
- Wall ties or toothing provided at junction of new wall with existing wall or column
- Lintels installed over all openings before brickwork continues above
- Maximum daily build height respected — not more than 1.2m (12 courses) per day
- Joints raked out 10–15mm while mortar is green if wall is to be plastered
- Movement joints provided at maximum 6m spacing in long brick walls
✓Curing & Protection+-
- Completed brickwork cured by spraying water — minimum 7 days
- Fresh brickwork protected from heavy rain — top of wall covered overnight
- No brickwork laid in frost conditions — ambient temperature above 5°C throughout curing period
- In temperatures above 38°C — mortar mix adjusted or work timed to avoid peak heat
✓Quality & Completion Checks+-
- Completed wall plumb checked — tolerance H/600 or 12mm maximum
- All door and window opening dimensions verified — clear width and height confirmed
- Completed wall inspected for cracks — stepped cracks at corners and over openings noted
- As-built dimensions recorded — wall positions, opening dimensions, and DPC level
Masonry reference tables
Common masonry unit sizes by region
| Unit Type | Typical Size (L x W x H) | Common Region | Typical Use |
|---|---|---|---|
| Modular clay brick | 190 x 90 x 90 mm | South Asia | Residential and partition walls |
| Standard brick | 215 x 102.5 x 65 mm | UK / Europe | Facing and structural brickwork |
| Standard modular brick | 194 x 92 x 57 mm (203 x 102 x 67 mm nominal) | US / North America | Veneer and structural brickwork |
| AAC block | 600 x 200 x 200 mm | Global | Lightweight load-bearing and partition walls |
| Concrete masonry unit (CMU) | 390 x 190 x 190 mm (400 x 200 x 200 mm nominal) | US / Australia / Global | Load-bearing block walls |
| Half-brick partition unit | 190 x 90 x 40 mm | Global | Non-load-bearing partition walls |
Enter your supplier's actual measured unit size in the Material Type & Unit Size inputs — catalogue sizes are a starting point, not a substitute for a checked sample.
Typical mortar mix ratios by wall type
| Cement : Sand Ratio | Typical Use | Notes |
|---|---|---|
| 1 : 3 | Below-grade, retaining, severe exposure | Highest-strength mix commonly used for masonry mortar |
| 1 : 4 | External walls and load-bearing masonry | Common structural masonry mix |
| 1 : 6 | Internal, non-load-bearing partitions | Standard general-purpose masonry mix |
| Thin-bed adhesive | AAC block walls | 2-3 mm joint; not a volumetric cement:sand mix |
Typical joint thickness and wastage guide
| Material | Typical Joint Thickness | Suggested Wastage % |
|---|---|---|
| Clay brick | 10 mm | 5-10% |
| Concrete block (CMU) | 10 mm | 5-8% |
| AAC block (thin-bed adhesive) | 2-3 mm | 3-5% |
| Stone masonry | 15-20 mm | 8-12% |
Use the higher end of each wastage range for walls with many corners, returns, or small openings, and the lower end for long, uninterrupted runs.
Usage
- Estimating brick or block quantity for a wall with door and window openings before placing a material order.
- Comparing brick versus AAC or concrete block material requirements for the same wall using the material type toggle.
- Planning mortar volume, including mortar allowance and wastage, ahead of cement and sand procurement.
- Checking plaster area for both wall faces before estimating plaster material with a follow-up calculator.
- Preparing an early masonry cost estimate for budgeting, using the optional unit cost and mortar cost fields.
- Cross-checking a contractor's brick or block quantity claim against an independent estimate.
Tips for Accurate Masonry Estimation
Use actual unit size, not nominal size
Bricks and blocks from different suppliers vary a few millimetres from the catalogue size. Measure a sample unit before ordering — even a 3-5 mm difference changes the count meaningfully across a large wall.
Enter total opening quantities across all similar walls
If several walls share the same door or window size, enter the combined quantity in one opening row rather than repeating the calculation per wall.
Increase wastage for short walls and many small openings
Short returns, corners, and small openings all require more cutting per square metre than a long, uninterrupted wall. Use 7-10% wastage for complex layouts instead of the 5% default.
Confirm whether plaster is measured on one face or both
This calculator's plaster area covers both wall faces. Some billing systems measure only one face, or apply different thicknesses to internal and external faces — check local convention before ordering plaster material.
Keep mortar joint thickness consistent with your material type
Clay brick walls typically use a 10 mm joint; AAC block walls use a thin-bed adhesive joint of 2-3 mm. Entering the wrong joint thickness changes both the unit count and mortar volume.
Keep masonry, mortar, plaster, and lintel quantities separate
Combining these into one lump-sum cost makes it harder to track overruns by trade. Cost each material line separately, even when ordering from the same supplier.
Common Mistakes
- Forgetting to deduct door and window openings, which overstates unit and mortar quantity on walls with several openings.
- Using nominal (catalogue) unit size instead of the actual supplied size, which shifts the count by several percent on a large wall.
- Applying the same mortar joint thickness to AAC blocks as to clay bricks — thin-bed block adhesive joints are much thinner than standard mortar joints.
- Ordering the theoretical quantity instead of the wastage-adjusted recommended quantity, leaving the site short mid-construction.
- Not accounting for lintel bearing length reducing the net masonry area directly above openings.
Limitations
This calculator assumes regular wall panels and rectangular openings. It does not account for bond pattern variation, lintel and sill detailing, jamb returns, curved walls, reinforcement, cavity walls, partial blocks, or local billing rules for small opening deductions.
Disclaimer: This calculator provides approximate results for planning and estimation purposes only. Actual requirements may vary based on site conditions, materials, workmanship, and local building regulations. Always consult a qualified engineer, architect, or construction professional before making final decisions.