Concrete block quantity calculator
Estimate blocks for a single-leaf wall.
Your measurements
Enter your project values. Your estimate updates as you type.
View your estimateExample values are a starting point. Check product yields and specifications before ordering.
YOUR ESTIMATE
Blocks to buy
Whole quantities are rounded up.
How it's calculated
Unit module = (unit length + joint) × (unit height + joint). Count = net area ÷ module, with waste, rounded up.
Calculations use consistent units for your selected measurements. The waste allowance is applied once to the measured requirement. Whole purchase quantities are rounded up.
What this estimate includes
Enter actual face dimensions and the mortar joint separately. Do not add a joint to nominal dimensions that already include it.
Quantity and arithmetic estimates only. Use project specifications for installation and design requirements.