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Brick and Block Quantity Estimator: Multi-Wall Count, Mortar Materials and Cost

Estimating brickwork by hand for more than one wall, each with its own doors and windows to subtract, gets tedious fast and getting the mortar volume wrong means either running short mid-build or over-ordering cement. This brick calculator and blockwork calculator handles clay bricks, modular or traditional, AAC blocks, concrete solid blocks and fly ash bricks, across as many walls as your project needs, each with its own openings deducted automatically. It works as a genuine mortar calculator too, converting the joint volume into actual cement bags and sand using your chosen mix ratio, applies a wastage factor on top and gives you a per-wall breakdown alongside combined totals and an optional material cost estimate.

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How to Use

Step 1: Set your unit type and mortar details

• Select your Unit Type: Clay Brick Modular, Clay Brick Traditional, AAC Block, Concrete Solid Block or Fly Ash Brick. Choosing one pre-fills standard length, width and height, though all three fields stay fully editable if your actual units are a different size.
• Check and adjust the Unit Length, Width, and Height in millimetres if needed.
• Enter your Mortar Joint thickness in millimetres, 10mm is the common default for brick and block work.
• Select your Mortar Mix ratio, 1:4 or 1:6 are listed or choose Custom and enter your own sand parts if your project specifies a different ratio.
• Enter your Wastage percentage, typically 5 to 10 percent, to cover breakage and site loss on top of the exact calculated quantity.

Step 2: Add your walls and their openings

• Tap Add Wall for each wall in your project. Enter that wall’s Length, Height and Thickness.
• Within each wall card, tap to add an Opening for every door or window in that wall, entering its width and height so the tool subtracts that area from the wall’s total volume automatically.
• Repeat for every wall in your project, adding as many as you need.

Step 3: Add cost details, if you want a price estimate

• Under Cost (optional), enter the Price per unit for your brick or block, the Price per cement bag and the Price per m³ of sand. Leave any of these at 0 to skip that part of the cost calculation.

Step 4: Get your estimate

• Tap Estimate Quantities. The result shows the total brick or block count, cement bags needed, sand volume and total material cost if you entered prices, all broken down per wall as well as combined into a project total.

Step 5: Export

• Use Print / PDF for a clean printable copy or Copy Result to paste the figures into your site record.

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Key Features

• Covers 5 unit types: Clay Brick Modular, Clay Brick Traditional, AAC Block, Concrete Solid Block and Fly Ash Brick, each with editable standard dimensions
• Multiple walls in one estimate, each with its own length, height and thickness
• Automatic opening deduction, subtracting doors and windows from each wall’s volume before counting units
• Joint-thickness-aware unit count using the standard volume method, giving the classic 500 bricks/m³ figure for modular brick with 10mm joints
• Mortar converted directly into cement bags and sand, using your selected or custom mix ratio
• Adjustable wastage factor applied to final purchase quantities
• Per-wall breakdown with combined totals, plus an optional material cost estimate
• Export as PDF or copy the result.

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Formula / Logic Used

Units per Cubic Metre (Standard Volume Method)

$$Units/m^3 = \frac{1}{(l+j)(h+j)(w+j)}$$

Where $l, h, w$ are the unit’s own dimensions and $j$ is the mortar joint thickness, all in the same unit. This is why a standard modular brick with 10mm joints works out to the well-known figure of roughly 500 bricks per cubic metre.

Net Wall Volume

$$Net\ Volume = (L \times H \times T) - \sum(Opening\ Width \times Opening\ Height \times T)$$

Mortar Volume and Materials

$$Mortar\ Volume = Net\ Volume - (Unit\ Count \times Unit\ Volume), \qquad Dry\ Volume = Wet\ Volume \times 1.33$$

$$Cement\ Volume = Dry\ Volume \times \frac{1}{1+n}, \qquad Sand\ Volume = Dry\ Volume \times \frac{n}{1+n}$$

Where $n$ is the sand parts in your 1:n mix ratio. One 50 kg cement bag equals 0.0347 m³, used to convert cement volume into a bag count.

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Who Should Use This Tool

Site engineers, contractors and quantity surveyors estimating brick or block material for a wall or full house project. also useful for diploma and B.Tech Civil Engineering students learning the standard volume method for brickwork quantity estimation.

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Frequently Asked Questions (FAQs)

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Related Tools

• Concrete Mix Design Calculator – for the concrete mix used in the same structure
• Bar Bending Schedule (BBS) Generator – plan the reinforcement for structural elements alongside this masonry
• Column Design Load Calculator – check the columns supporting the walls estimated here

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