Architect Tools

Masonry · Calculator

Concrete Block Calculator

Estimate concrete masonry units for a wall including openings, joints and waste.

Project inputs

Enter your project values, then press Calculate.

How this calculator works

Estimate concrete masonry units for a wall including openings, joints and waste.

blocks = net wall area ÷ modular block face × (1 + waste%)

How to use the Concrete Block Calculator

1. Enter project inputs

  • Wall width (m)
  • Wall height (m)
  • Openings area (m²)
  • Block length (mm)
  • Block height (mm)
  • Mortar joint (mm)

2. Review the results

  • Blocks to order
  • Before waste
  • Net wall area

3. Check the calculation

The calculator uses the following core relationship:

blocks = net wall area ÷ modular block face × (1 + waste%)

Estimating note: Actual material quantities can vary with site conditions, detailing, product dimensions, installation method, and waste.

Concrete Block Calculator FAQ

What does the Concrete Block Calculator calculate?

Estimate concrete masonry units for a wall including openings, joints and waste.

What information do I need to use the Concrete Block Calculator?

The calculator uses inputs such as Wall width (m), Wall height (m), Openings area (m²), Block length (mm), and Block height (mm). Use values from your drawings, measurements, product data, or project specifications.

How should I use the results from the Concrete Block Calculator?

Use outputs such as Blocks to order, Before waste, and Net wall area for estimating and cross-checking. Before purchasing or construction, confirm the dimensions, units, waste factors, supplier packaging, and project specifications.