How the Concrete Block Calculator works
Blocks = Wall area ÷ ((Block length + joint) × (Block height + joint)) plus wastage.
How to use this calculator
- Sign up free and verify your email to unlock the calculator.
- Choose Metric (m, mm, m³, kg) or Imperial (ft, in, cft, lb) units.
- Enter the wall length, wall height, block length, block height, joint, wastage.
- Results update instantly — read the quantities in the Results panel.
- Add a wastage allowance and confirm against your drawings and specifications before ordering.
Typical uses
Hollow and solid concrete block (CMU) walls.
Assumptions & limitations
Results are planning estimates based on standard assumptions for concrete & masonry work. They do not replace structural design, site measurement or project specifications. Material densities, wastage and mix proportions vary by region and supplier.
Frequently asked questions
- How does the Concrete Block Calculator work?
- Blocks = Wall area ÷ ((Block length + joint) × (Block height + joint)) plus wastage.
- Can I use the Concrete Block Calculator in feet and inches?
- Yes. Switch to Imperial and enter feet, inches, square feet or pounds — the calculator converts automatically and shows results in imperial units.
- When should I use the Concrete Block Calculator?
- Hollow and solid concrete block (CMU) walls.
- Is this construction calculator free?
- Yes. All CM PRO construction calculators are free — you only need to sign up and verify your email.
Related searches: concrete block calculator, CMU calculator, blocks per square metre, hollow block wall.
