Cinder Block Wall Calculator
Calculate Cinder Block Wall Materials
Estimate blocks, mortar, and rebar for a block wall
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Formula
Blocks = Wall Length (ft) x Wall Height (ft) x 1.125 blocks/sq ft x 1.10 waste factor
Frequently Asked Questions
How many cinder blocks do I need per square foot?
You need approximately 1.125 standard 8x8x16 cinder blocks per square foot of wall, which accounts for the 3/8-inch mortar joints between blocks.
How much mortar do I need for a cinder block wall?
One 80-pound bag of mortar mix will lay approximately 30 standard cinder blocks. For a 100-block wall, plan on about 3-4 bags of mortar.
Do cinder block walls need rebar?
Yes, most building codes require vertical rebar every 4 feet and horizontal rebar every 2-3 courses. The cells containing rebar must be filled with grout. Always check local codes.
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