Opening Reveal Finish Area calculator.
Count the exposed jamb, head and sill surfaces separately from the flat wall face around openings.
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.
Count the exposed jamb, head and sill surfaces separately from the flat wall face around openings. Measured finish surface only; no opening construction, lintel, window or fire detail.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Opening clear width
- 1 m
- Opening clear height
- 2 m
- Measured exposed reveal depth
- 0.2 m
- Exposed vertical jambs
- 2
- Exposed head and sill faces
- 1
- Matching openings
- 1
Exposed reveal surface: 1 m²
Flat rectangular reveals only. Returns are additional surfaces, not a second deduction from the wall face.
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.
Measured finish surface only; no opening construction, lintel, window or fire detail.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.