Trapezoid Seat Pad Foam Blank Sheet calculator.
Preserve full rectangular source blanks for supplied trapezoid seat pads and show retained foam volume separately.
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 = max(front width, back width); net seat area = (front width + back width) × depth/2; retained volume = net area × supplied thickness. Does not choose foam firmness, thickness, fire properties or seating 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
- Already selected foam thickness
- 50 mm
- Measured front width
- 0.6 m
- Measured back width
- 0.4 m
- Measured seat depth
- 0.5 m
- Identical pads
- 4
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. Angled side offcuts do not reduce source blank count.
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 foam firmness, thickness, fire properties or seating 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.