Concrete blocks are generally cheap, usually around $2-$4, when you are thinking of the most common building block, the 8″x8″x16″ measured cinder block. However, when you calculate the total number of blocks needed, you want to get an accurate number of blocks, so you don’t have an overabundance, or worse, a shortage.
Use our calculator to calculate windows, doors, waste allowance, mortar bag weight, plus more. You can also estimate the price of what your project will cost on top of how many blocks you will need!
Concrete blocks are the foundation for most modern buildings, let’s get this right the first time.
Our calculator has been used by projects in real life situations before putting it on the website to ensure accuracy. While our results were accurate, yours may vary.
Concrete Block Wall Estimator
Estimate the number of standard concrete masonry blocks, mortar bags, and approximate material cost required for one or more walls.
Measurement Settings
Enter wall and opening measurements in feet. Decimal measurements such as 12.5 feet are supported.
Wall Sections
Enter each differently sized wall as a separate section. Use the quantity field for identical walls.
Wall 1
Doors, Windows, and Openings
Openings are optional. Their total area will be deducted from the gross wall area.
Material Allowances
Adds extra blocks for cuts, damage, and breakage.
Adjust this value to match the yield listed by the mortar manufacturer.
Optional Material Prices
Leave either price blank if you only need material quantities.
Result Options
Estimator Assumptions
- Nominal Block Size
- 8 × 8 × 16 inches
- Installed Block Face
- 8 × 16 inches
- Mortar Joint
- Approximately ⅜ inch
- Base Coverage Rate
- 1.125 blocks per square foot
This estimator provides planning quantities for standard 8-inch concrete masonry units. Actual requirements can vary because of bond patterns, partial blocks, reinforcement, pilasters, corners, site conditions, workmanship, and the mortar product being used. Confirm final quantities with project plans and product instructions.