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For a calculation question, include
- Wall length, height and measurement units.
- Selected block size, opening sizes and quantities.
- Waste allowance and optional price or pallet quantity.
- The result shown, the result you expected and the reason.
A copied estimate link includes your calculator inputs. Share it only if you are comfortable sending those details. Avoid including private project information you do not need to share.
For an explanation first, see the formula, worked examples and assumptions. The calculator estimates block materials; it does not provide structural designs or an installed construction quote.