FREE SITE TOOLS
Concrete block calculator
Estimate blocks for a wall, allowing for openings, joints and waste.
Free · No account · Instant result
Enter your measurements
Net area = length × height − openings. Count = net area ÷ block face with joint × (1 + waste).
Blocks required
342 blocks
Net area
28 m²
Indicative estimate. Check drawings, waste and product data sheets. This does not replace an engineering study.
A useful number to share with your manager
Add a project name and copy a clear summary for your site manager, project lead or director.
The quantity is clear. What comes next?
Rochemère connects your BOQ, purchasing, budget and actual costs in one project. Share this result with your team and explore a guided pilot.
METHOD
An estimate you can verify
Block size and joint thickness determine coverage per block. The result rounds up to a whole block. Check the supplier’s actual dimensions.
FAQ
Are windows deducted?
Yes. Enter their total area as openings.
Is mortar included?
No. Joints affect the count, but mortar quantity is not calculated.