Concrete Block Calculator
Calculate Blocks Needed
Calculate concrete blocks and mortar for a wall
Formula
Blocks = Wall Area (sq ft) x 1.125 x 1.05 | Mortar Bags = Blocks / 100 x 3
Frequently Asked Questions
How many concrete blocks per square foot?
Standard 8x8x16 inch CMU blocks require 1.125 blocks per square foot of wall area, accounting for the 3/8-inch mortar joint.
How much mortar do I need for concrete blocks?
Plan for approximately 3 bags (80-lb) of mortar mix per 100 blocks. This covers bed joints and head joints for standard 8x8x16 CMU blocks.
How many courses of block for an 8-foot wall?
An 8-foot wall requires 12 courses of standard 8-inch CMU blocks (8 feet / 8 inches per course = 12 courses).
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