CMU Block Calculator
Estimate concrete masonry units, mortar, and grout for a block wall. Standard 8x8x16 block sizing included.
Frequently Asked Questions
How many CMU blocks per square foot?
Standard 8x8x16 blocks cover about 0.889 square feet each, so 1.125 blocks per square foot of wall area.
How much mortar for CMU blocks?
Plan for about 3 bags of mortar mix per 100 blocks, assuming 3/8-inch mortar joints.
How tall can a CMU wall go unreinforced?
Most codes allow up to 4 feet unreinforced. Taller walls require vertical rebar and grouted cores.