Concrete Block Calculator
Calculate the number of concrete blocks needed.
How It Works
Blocks = ceil(Wall area ÷ (16 × 8 ÷ 144)) = ceil(Area × 1.125).
Example
A 20 ft × 8 ft wall needs 180 standard 8x8x16 blocks.
Frequently Asked Questions
What size is a standard block?
The nominal 8x8x16 block has a 16 × 8 in face and covers 0.89 sq ft per block.
Do all block widths use the same face?
Yes — 4, 8, and 12 in blocks share the same 16 × 8 face, so block count is identical.
Should I add for waste?
Add 5% for cuts and damage; more for walls with many openings.