Alternating-radius star finish.
Record the supplied outer and inner radii and number of star points.
Read the right quantitative data
Selected coverage and any supplied cutout area.
Check this ordering assumption
A star's bounding circle is much larger than its actual painted face.
The alternating-radius model counts the specified simple face and not its backing or attachment.
A worked quantity method
This illustrative set of supplied inputs demonstrates Alternating Radius Star Face Coating Calculator. Replace the example measurements and product figures with your own before ordering.
| Supplied input | Metric display | US display |
|---|---|---|
| Supplied coat count | 1 | 1 |
| Chosen product coverage | 1 m²/L | 40.75 ft²/US gal |
| Selected container volume | 1 L | 0.26 US gal |
| Supplied alternating-radius star 1: Outer point count | 5 | 5 |
| Supplied alternating-radius star 1: Outer point radius | 0.5 m | 1.64 ft |
| Supplied alternating-radius star 1: Inner vertex radius | 0.2 m | 0.66 ft |
| Supplied alternating-radius star 1: Identical faces | 4 | 4 |
Selected coating containers: 2 containers
- Measured coated area
- 1.18 m²
- Required liquid
- 1.18 L
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.
Open this example in the full calculatorYour measurement and product-data sheet
Record what you know and mark verified items ready. Notes save on this browser after you edit them. Download a copy before clearing browser data.
Record the supplied outer and inner radii and number of star points.
Selected coverage and any supplied cutout area.
A star's bounding circle is much larger than its actual painted face.
Input for Alternating Radius Star Face Coating Calculator. Record the value with its unit and quantity basis.
Input for Alternating Radius Star Face Coating Calculator. Record the value with its unit and quantity basis.
Input for Alternating Radius Star Face Coating Calculator. Record the value with its unit and quantity basis.
Input for Alternating Radius Star Face Coating Calculator. Record the value with its unit and quantity basis.
Input for Alternating Radius Star Face Coating Calculator. Record the value with its unit and quantity basis.
Input for Alternating Radius Star Face Coating Calculator. Record the value with its unit and quantity basis.
Input for Alternating Radius Star Face Coating Calculator. Record the value with its unit and quantity basis.
Choose your next calculation
Alternating Radius Star Face Coating Calculator
Measure a supplied simple star face with evenly alternating outer and inner radii before calculating coating containers.
Polygon Area Calculator
Measure an irregular plan outline from ordered coordinate points.
Turn the estimate into an order
- Confirm that all quantities use the same measured basis and the selected product's current data.
- Keep different products, finishes and handed variants in separate purchase lines.
- Review exact demand and whole-pack purchase quantities before entering your quoted prices.
- Record compatible stock already on hand, then save the remaining order in your browser project.
Measurement and purchase guides
Other materials in this family
Reviewed 6 October 2026. Geometry and purchase arithmetic use your measurements and selected specifications. Calculation scope.