Cement Block Calculator
Calculate the number of cement blocks, mortar, and costs needed for a wall or structure.
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isCalculator Editorial Team
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How to use this tool?
How to Use the Cement Block Calculator
- Enter Wall Dimensions – Input the Wall Height and Wall Length in feet (e.g., 10 ft and 20 ft). Only positive numbers are accepted.
- Select Block Size – Choose from the dropdown (e.g., 8"x8"x16" Standard). The calculator uses the block’s face area to determine quantity.
- Set Costs – Enter the Price per Block and Price per Mortar Bag in dollars (e.g., $1.50 and $10.00).
- Adjust Mortar Coverage – Specify how many square feet one bag of mortar covers (default 100 sq ft).
- Click “Calculate” – The results instantly show:
- Blocks Needed – Total blocks including 5% waste.
- Mortar Bags Needed – Rounded up to the nearest whole bag.
- Total Block Cost, Total Mortar Cost, and Total Cost.
Note: All inputs use imperial units (feet, inches, square feet). Ensure values are positive; invalid entries will highlight in red.
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Frequently Asked Questions
For a standard 8x8x16 block, you need approximately 236 blocks including 5% waste.
One bag of mortar (typically 80 lbs) covers about 100 sq ft of wall area, which is roughly 100-120 blocks depending on joint thickness.
The most common size is 8" x 8" x 16", which covers 1.125 sq ft per block including mortar joints.