Specified Gable Wall Surface calculator.
Measure a rectangular wall face plus its supplied triangular gable, with openings deducted once.
Your inputs
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
Measure a rectangular wall face plus its supplied triangular gable, with openings deducted once. Surface takeoff only, not roof, wall or lintel design.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Wall base width
- 4 m
- Rectangular wall height
- 2 m
- Specified triangular gable rise
- 1 m
- Measured combined opening area
- 1 m²
- Matching faces
- 1
Net gable wall finish area: 9 m²
Symmetric triangle above a rectangular wall. Geometry is supplied; no roof slope, wall support or opening construction is chosen.
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
Surface takeoff only, not roof, wall or lintel design.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.