Rectangular Duct Jacket Sheet Blank calculator.
Develop a supplied rectangular jacket perimeter plus seam extra into complete blanks and allocate those blanks to stock sheets.
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.
Blank width = 2(width + height) + supplied seam extra; blank length = measured segment length + two supplied end extras. Does not select duct sizing, sheet gauge, pressure class, fire properties or insulation requirements.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Usable stock width
- 2 m
- Usable stock length
- 3 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 jacket width
- 0.3 m
- Supplied jacket height
- 0.2 m
- Measured jacket length
- 1 m
- Identical jackets
- 3
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.
Does not select duct sizing, sheet gauge, pressure class, fire properties or insulation requirements.
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.