Estimate Concrete Blockwork Quantities For Walls, Openings, Repeated Wall Sections And Simple Block Piers. Enter Your Own Wall Dimensions, Block Face Size, Joint Allowance, Waste Percentage, Price Per Block And Optional Mortar Allowance To Build A Clear Material Take-Off Before Ordering.
All Fields Start Blank With A Soft Zero Placeholder. Type Your Own Measurements And The Zero Will Not Be Added In Front Of The Number. Results Stay Hidden Until You Press Calculate Blockwork.
Your Result Will Appear Here After You Press Calculate Blockwork.
The PDF Includes Blockwork Layout, Wall Measurements, Block Face Size, Joint Allowance, Waste, Final Block Quantity, Optional Mortar Planning And Block Material Cost.
Start With The Net Blockwork Area. Divide That Area By The Effective Face Area Of One Block Including The Joint Allowance, Round Up To Whole Blocks, Then Add Waste Or Breakage.
The Result Separates Net Blockwork Area, Base Block Quantity, Waste, Optional Mortar Planning And Block Material Cost.
See The Wall Surface After Openings Are Removed Where Applicable.
Estimate Whole Blocks From The Effective Face Area Of The Block And Joint.
Add A Percentage For Cuts, Damage And Small Layout Differences.
Use Your Own Mortar Allowance Per m² To Build A Simple Volume Planning Figure.
Multiply Final Block Quantity By Your Own Price Per Block.
Save The Main Measurements And Blockwork Quantity With The Site Name.
Concrete Blockwork Estimating Starts With Net Wall Area. Measure The Length And Height Of Each Wall, Multiply Them To Get Square Metres, Then Subtract Any Major Openings. Once The Net Area Is Known, Divide By The Effective Face Area Of One Block Including The Joint Allowance.
Wall Area (m²) = Wall Length (m) × Wall Height (m)Net Area = Gross Wall Area − Door Area − Window AreaUse The Opening Area From The Real Drawing Or Measure Width × Height For Each Door And Window. For Several Openings, Add Their Areas Together Before Subtracting Them From The Wall.
The Physical Block Face And The Mortar Joint Work Together As A Modular Unit. Add The Joint Allowance To The Block Face Length And Height Before Calculating The Effective Face Area.
((Block Length + Joint) ÷ 1000) × ((Block Height + Joint) ÷ 1000)| Example Effective Module | Effective Face Area | Approx. Blocks Per m² | Blocks For 20 m² |
|---|---|---|---|
| 400 × 200 mm | 0.080 m² | 12.50 | 250 |
| 410 × 210 mm | 0.086 m² | 11.61 | 233 |
| 300 × 200 mm | 0.060 m² | 16.67 | 334 |
| 500 × 250 mm | 0.125 m² | 8.00 | 160 |
Add Waste After The Base Block Count Is Rounded Up. Waste Can Cover Cut Blocks, breakage and small layout changes, but the right percentage depends on the wall design and number of corners, openings and special units.
For Identical Walls, Calculate One Wall And Multiply By Quantity. If Walls Differ In Length Or Height, Calculate Them Separately And Add The Totals For A Better Take-Off.
The Pier Option Uses Face Width × Height × Number Of Blockwork Faces × Pier Quantity. It Is A Simple Surface-Area Method And Does Not Replace A Detailed Structural block schedule.
Mortar Use Depends On Block Size, joint thickness, workmanship and wall details. Instead Of Assuming One Fixed National Rate, This Calculator Lets You Enter Your Own Mortar Allowance In m³ Per m² Of Blockwork.
The Cost Result Multiplies Final Block Quantity By The Price Per Block You Enter. It Does Not Automatically Include mortar, grout, reinforcement, lintels, freight, labour, scaffolding, render or waterproofing.
Real Blockwork Can Need Half Blocks, corner units, bond beams, lintels, reinforced cells and other special products. These should be checked separately against the drawings and product schedule.
This Tool Does Not Decide Wall Thickness, block strength, reinforcement, footing size, lintels, control joints, retaining wall design or structural requirements. It Is A Quantity Calculator Based On The Dimensions You Enter.
Keeping Area, Block Module, Waste And Special Details Separate Makes The Estimate Easier To Check.
Measure Wall Length, Height And Any Openings.
Enter The Actual Block Face Size And Joint Allowance.
Divide Net Area By Effective Block Face Area.
Round Up And Add A Practical Breakage Allowance.
These Examples Use A Simple 12.5 Blocks Per m² Reference To Show The Method Only.
| Blockwork Example | Net Area | Blocks Per m² | Base Blocks | With 5% Waste |
|---|---|---|---|---|
| Small Wall | 8.00 m² | 12.50 | 100 | 105 |
| Garden Wall | 12.00 m² | 12.50 | 150 | 158 |
| Garage Blockwork | 24.00 m² | 12.50 | 300 | 315 |
| Large Wall | 40.00 m² | 12.50 | 500 | 525 |
Simple Answers About Wall Area, Block Quantity, Openings, Joint Allowance, Mortar And Cost.
Calculate Net Wall Area, Divide By The Effective Block Face Area Including The Joint, Round Up, Then Add Waste.
Yes. Use The Wall With Openings Option And Enter The Total Door And Window Areas.
The Joint Helps Create The Effective Modular Block Face Used To Estimate Blocks Per Square Metre.
Yes. Use The Block Pier / Column Option For A Simple Face-Area Estimate.
Yes. Enter Your Own Mortar Allowance In m³ Per m² To Get A Simple Planning Volume.
The Zero Is Only A Placeholder. Typing A Number Replaces It, So No Leading Zero Is Added.
No. The Cost Result Uses Only Final Block Quantity × Price Per Block.
There Is No Single Percentage For Every Wall. More cuts, corners and openings can increase breakage and waste.
Yes. Enter One Wall's Length And Height, Then Enter The Quantity.
The PDF Includes Layout, measurements, block size, joint, waste, final blocks, optional mortar planning and block material cost.
Check Current Product Dimensions, Supplier Information And Project Requirements Before Ordering Concrete Blocks Or Mortar Materials.
Australian Industry Information And Technical Resources For Concrete And Masonry Construction.
Visit CCAANational Safety Information About Silica And Construction-Related Work Hazards.
Read Silica GuidanceConfirm Exact Block Dimensions, Special Units, Pack Quantities And Current Prices.
Use The Real Wall Dimensions, Openings And Structural Details For The Final Take-Off.