How it works
Net face area = wall length × height − openings. Divide by (brick length+joint) × (brick height+joint), convert mm² to m², add waste and round up.
Input definitions
- Wall length (m)
- Enter the value in the labeled unit.
- Wall height (m)
- Enter the value in the labeled unit.
- Opening area (m²)
- Enter the value in the labeled unit.
- Brick face length (mm)
- Enter the value in the labeled unit.
- Brick face height (mm)
- Enter the value in the labeled unit.
- Mortar joint width (mm)
- Enter the value in the labeled unit.
- Waste allowance (%)
- Enter the value in the labeled unit.
A worked example
- Wall length (m)
- 5
- Wall height (m)
- 2
- Opening area (m²)
- 0
- Brick face length (mm)
- 215
- Brick face height (mm)
- 65
- Mortar joint width (mm)
- 10
- Waste allowance (%)
- 5
Assumptions & limits
Single rectangular wall face, uniform brick face and joints. Not a structural design, mortar-volume estimate or local building-code check.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Does this count both leaves of a cavity wall?
No. The estimate covers one wall face or leaf using the visible brick dimensions. Estimate each different leaf separately and account for bonds, corners and structural details.
Should I order exactly the quantity shown?
Treat the result as a planning estimate. Check measurements, units, pack sizes, waste, openings and local requirements; the stated formula does not replace a project-specific design.
How does the Brick wall quantity with mortar joints tool work?
Net face area = wall length × height − openings. Divide by (brick length+joint) × (brick height+joint), convert mm² to m², add waste and round up.
What are the assumptions and limits of Brick wall quantity with mortar joints?
Single rectangular wall face, uniform brick face and joints. Not a structural design, mortar-volume estimate or local building-code check.