Round Duct Sleeve Sheet Blank calculator.
Develop measured circular sleeves into flat rectangles using supplied seam and end extras, then preserve whole blank fit.
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.
Sleeve blank = (π × supplied sleeve diameter + seam extra) × (segment length + 2 × end extra). Uses your supplied sleeve diameter; does not determine neutral bend diameter, gauge or system suitability.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Usable stock width
- 1 m
- Usable stock length
- 2 m
- Your reserved cutting gap
- 0 m
- Permitted blank orientation
- Fixed orientation
- Supplied seam extra
- 0 m
- Supplied extra at each end
- 0 m
- Supplied developed sleeve diameter
- 0.2 m
- Measured sleeve length
- 1 m
- Identical sleeves
- 2
Sheets for this rectangular allocation: 1 sheets
Longest-side-first placement with disjoint rectangular remainder regions and reserved cutting gaps. Feasible allocation, not a guaranteed minimum or machine cutting procedure.
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 your supplied sleeve diameter; does not determine neutral bend diameter, gauge or system suitability.
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.