Concrete Block Calculator
Estimate concrete blocks needed for your wall
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Frequently Asked Questions
How do I calculate concrete block quantity?
Block count = (Wall area ÷ (Block area + Mortar area)). Add 5-10% for waste and cuts.
What are standard concrete block sizes?
Common sizes: 8″ x 8″ x 16″, 6″ x 8″ x 16″, 12″ x 8″ x 16″. Actual dimensions are 3/8″ less to allow for mortar joints.
How much mortar do I need?
Approximately 3 bags of mortar per 100 blocks. Add 10% for waste.
What about openings in the wall?
Subtract the area of doors/windows from total wall area before calculating block quantity.
How do I account for different block patterns?
Standard running bond is most efficient. Special patterns may require 5-10% more blocks.