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Calculators / Construction / Gable-end wall area
Gable-end wall area calculator
Estimate the face area of a rectangular wall topped by a triangular gable.
On this page
Gross wall area32m²
Net wall area28m²
Calculator controls
How to calculate
Estimate the face area of a rectangular wall topped by a triangular gable.
Gross wall area =
w*h+w*rise/2 m²Net wall area =
w*h+w*rise/2-open m²Worked example
- Wall width (m): 8
- Rectangular wall height (m): 3
- Gable rise (m): 2
- Total opening area (m²): 4
- Gross wall area: 32 m²
- Net wall area: 28 m²
Assumptions and limits
All lengths must use one common unit. These are ideal geometric measurements; allowances, thickness, manufacturing tolerances and measurement uncertainty are excluded. The gable shares the wall width; openings cannot exceed gross area. Roof slopes and structural loads are not calculated.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate the face area of a rectangular wall topped by a triangular gable. Use the rise above the rectangular wall, then subtract measured door and window openings for a net facing estimate.
When this tool is useful
Use the rise above the rectangular wall, then subtract measured door and window openings for a net facing estimate.
Understanding your inputs
| Input | Example |
|---|---|
Wall width (m) w | 8 |
Rectangular wall height (m) h | 3 |
Gable rise (m) rise | 2 |
Total opening area (m²) open | 4 |
Frequently asked questions
Which assumptions matter for this result?
All lengths must use one common unit. These are ideal geometric measurements; allowances, thickness, manufacturing tolerances and measurement uncertainty are excluded. The gable shares the wall width; openings cannot exceed gross area. Roof slopes and structural loads are not calculated.
How can I check the worked example?
Use the displayed example inputs in the stated formula. Keep each quantity in its labelled unit and compare the unrounded result before applying display rounding.