Polygonal Stave Ring Geometry calculator.
Measure the inside and outside widths of an already specified polygonal stave ring.
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.
Uses an apothem rather than the centre-to-vertex radius. The two face widths differ because a radial wall thickness creates trapezoidal staves.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Identical staves
- 4
- Specified inner apothem
- 1 m
- Specified radial wall thickness
- 100 mm
- Stave height
- 1 m
Outside stave face width: 2.2 m
A regular polygonal ring with trapezoidal cross-sections is assumed. These geometry angles do not specify machine setup, joinery, pressure capacity or safe fabrication.
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.
Uses an apothem rather than the centre-to-vertex radius. The two face widths differ because a radial wall thickness creates trapezoidal staves.
Dimensions, quantities, prices, timing and product properties are supplied by you. This tool does not select construction specifications or assess structural, electrical or hydraulic suitability.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.