What this calculator does
Concrete block core fill works out grout volume to fill the hollow cores of concrete masonry blocks. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
The inputs explained
| Field | What to enter |
|---|---|
| Inside core width (block width minus face shells) (in) | A number, measured in in. Starts at 13.5. |
| Inside core thickness (block thickness minus webs) (in) | A number, measured in in. Starts at 6. |
| Block height (in) | A number, measured in in. Starts at 8. |
| Number of blocks to fill | A number. Starts at 90. |
| Waste allowance (%) | A number, measured in %. Starts at 10. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with inside core width (block width minus face shells)
Every other input is held at the calculator’s starting values while inside core width (block width minus face shells) varies. Select any row to load that scenario into the calculator.