Concrete Block Calculator (CMU)
8×8×16 blocks (or AAC) plus mortar for a wall.
The US rule '1.125 blocks per square foot' is exactly 12.5/m². AAC's bigger faces lay 40% faster with thin-bed adhesive instead of mortar — different estimate lines entirely.
Formula
Concrete Block Calculator (CMU) is a free concrete block calculator for civil engineers, contractors and quantity surveyors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Concrete Block Calculator (CMU)
8×8×16 blocks (or AAC) plus mortar for a wall. The calculation implements CMU: 12.5 blocks/m² (1.125/ft²); AAC 600×200: 8.33/m² (NCMA TEK notes; AAC manufacturer data). The US rule '1.125 blocks per square foot' is exactly 12.5/m². AAC's bigger faces lay 40% faster with thin-bed adhesive instead of mortar — different estimate lines entirely.
How to use Concrete Block Calculator (CMU)
- 1Enter Wall length in m.
- 2Enter Wall height in m.
- 3Enter Block type (1 CMU 400×200 face · 2 AAC 600×200 face).
- 4Enter Openings in m².
- 5Read Blocks (with 5% waste), Mortar bags (type S ~ per 35 blocks) instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Concrete Block Calculator (CMU)?
- ✓Implements the standard formula — CMU: 12.5 blocks/m² (1.125/ft²); AAC 600×200: 8.33/m²
- ✓Reference cited on-page: NCMA TEK notes; AAC manufacturer data
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Concrete Block Calculator (CMU) use?+
It computes CMU: 12.5 blocks/m² (1.125/ft²); AAC 600×200: 8.33/m², per NCMA TEK notes; AAC manufacturer data. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
The US rule '1.125 blocks per square foot' is exactly 12.5/m². AAC's bigger faces lay 40% faster with thin-bed adhesive instead of mortar — different estimate lines entirely.
Does it include wastage?+
Yes — standard wastage/bulking factors are built in and stated in the formula line, so the quantity is an orderable number, not a bare geometric volume.
Is the Concrete Block Calculator (CMU) free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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