MihsabaHow to use
Estimate concrete block count from net wall area, block face dimensions, joint thickness and waste.
- Enter Wall area (m²).
- Enter Openings (m²).
- Enter Block face length (mm).
- Enter Block face height (mm).
- Enter Joint thickness (mm).
- Enter Waste (%).
- Calculate, then review the assumptions before purchasing.
How it is calculated
Example
A 40 m² wall with 4 m² of openings, 400×200 mm blocks, a 10 mm joint and 5% waste needs about 440 blocks.
Important notes
The estimate uses face module area and does not model wall thickness, special blocks or cuts around structural elements. Check construction drawings before final ordering.
Worked examples and interpreting results
A 40 m² wall with 4 m² of openings, 400×200 mm blocks, a 10 mm joint and 5% waste needs about 440 blocks.
| Case | Calculation | Result |
|---|---|---|
| Net area | 40 − 4 | 36 m² |
| Blocks | ceil(36 × 1.05 ÷ (0.410 × 0.210)) | 440 |
How to check the result
The estimate uses face module area and does not model wall thickness, special blocks or cuts around structural elements. Check construction drawings before final ordering.
Frequently asked questions
Does the calculator account for wall thickness?
No. It estimates units from face area. Multi-leaf walls or structural details require a separate takeoff.
Should I include waste?
Include an allowance when cuts, breakage or layout losses are expected. Use a percentage that fits your project rather than assuming one fixed rate.
Do the units need to match?
Yes. The calculator assumes the units stated beside each field, so convert measurements first when your source uses different units.