Concrete Block Calculator
Estimate how many blocks you need—fast and simple
Planning to build a wall, foundation, or another structure using concrete blocks? This calculator helps you quickly figure out how many blocks to buy, how much fill you'll need, and roughly what it might cost.
Whether it's a small backyard wall or a full basement foundation, just choose what you're building, plug in the dimensions, and let the calculator do the rest.
Wall Dimensions
Block Dimensions
Settings
Results
Estimated materials needed
Total Blocks Needed
24
Includes a 10% waste factor.
$48.00
Total Block Cost
Concrete Needed to Fill Blocks
0.29 yd³
or 7.78 ft³
This is an estimate for filling the cores of all blocks.
What You'll Get
- Total number of blocks required
- Block fill volume (if you're filling them)
- Wall area in square feet/meters
- Estimated cost based on your block size
- Optional extras like waste allowance and mortar gaps
It works with standard concrete block sizes and lets you switch between metric and imperial units. Perfect if you're figuring out materials before heading to the store—or just trying to stay within budget.
Works for All Kinds of Projects
You can use this for:
- Straight walls
- Foundation walls
- Retaining walls
- Sloped or stepped block structures
- Sheds, planters, or garden walls
As you pick different project types from the dropdown, the calculator updates to match—showing more details, and adjusting calculations to fit your exact use case.
No Guesswork, No Hassle
This tool was built for regular folks who want straight answers. You don't need to know block formulas or construction math—just enter your dimensions and you're good to go.
- Fast results
- Metric or imperial support
- Works for all wall types
- Ideal for DIYers and small builds
