Alternating Radius Star Face Coating calculator.
Measure a supplied simple star face with evenly alternating outer and inner radii before calculating coating containers.
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.
Face area = point count × outer radius × inner radius × sin(π/point count). Does not choose a shape, finish, material or fabrication method.
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 point count
- 5
- Outer point radius
- 0.5 m
- Inner vertex radius
- 0.2 m
- Identical faces
- 4
Selected coating containers: 2 containers
A non-crossing boundary through alternating radii in angular order. Self-crossing star polygons use a different model. 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 a shape, finish, material or fabrication method.
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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