Rounded Rectangle Inset Frame Coating calculator.
Measure a supplied rounded rectangle face border with a matching inset radius rather than subtracting unrelated rectangle areas.
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.
Rounded rectangle area = width × height − (4 − π) × radius²; inner dimensions reduce by 2 × inset and inner radius by inset. Does not choose radius, border size, supporting structure or finish coats.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Supplied coat count
- 1
- Chosen product coverage
- 1 m²/L
- Selected container volume
- 1 L
- Outer width
- 2 m
- Outer height
- 1 m
- Supplied outer corner radius
- 0.2 m
- Supplied face inset
- 0.1 m
- Identical frames
- 1
Selected coating containers: 1 containers
Matched uniform inset model with inset no greater than the supplied outer corner radius. Other corner constructions are excluded. Coating suitability and coat count are not selected.
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.
Does not choose radius, border size, supporting structure or finish coats.
All dimensions, properties and application patterns are user-supplied. No building-code default is inserted.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-06. Calculation and review policy.
Check your purchase assumptions
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