Concrete Block Calculator
Calculate the number of concrete blocks needed for your wall or construction project, along with mortar requirements.
Calculate Your Concrete Block Calculator
Wall Dimensions
Concrete blocks (also called cinder blocks or CMUs - Concrete Masonry Units) are widely used in construction for walls, foundations, and other structures. Accurately estimating the number of blocks needed helps with budgeting and reduces waste.
When planning a concrete block project, you'll need to consider the wall dimensions, block size, mortar thickness, and any openings like doors or windows. Different block sizes and shapes may be required for different applications.
How to Use This Calculator
- Enter the length and height of your wall in feet.
- Select the block size you'll be using.
- Add any openings such as doors or windows.
- Click "Calculate" to get the number of blocks and amount of mortar needed.
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Frequently Asked Questions
For a standard 8×8×16 inch block, you would need approximately 150 blocks for a 10' x 8' wall. This calculation accounts for a standard mortar joint thickness and excludes any openings.
On average, you'll need about 0.02 cubic feet of mortar per standard concrete block. For 100 blocks, plan for approximately 2 cubic feet of mortar.
The most common concrete block size in the US is 8×8×16 inches (nominal dimensions), though the actual dimensions are slightly smaller to account for mortar joints.
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