Use the free Wall Block Calculator on ToolVexa to estimate how many standard blocks you need for a wall, including a waste allowance.
How to Use
Enter the wall length, wall height and waste allowance percentage, then press Calculate.
Formula in Plain Words
Divide the wall area by the face area of a standard 16 by 8 inch block (0.8889 sq ft), add the waste percentage, and round up.
Worked Example
For a wall 20 ft by 8 ft with 10% waste, the wall area is 160 sq ft and the blocks needed are 198.
FAQs
What block size is used?
A standard 16 by 8 inch block face, which is 0.8889 square feet.
Should I allow for waste?
Yes. A 10% allowance is common for cuts and breakage.
Does this include mortar?
No. It counts blocks only, so plan mortar and other materials separately.