Background Calculator — Backdrop Panels & Print Size
Size backdrop panels and calculate print dimensions for your diorama background.
Add overlap at joins
20mm overlap where panels meet
How We Calculate This
The calculator sizes your backdrop based on the base dimensions and your chosen shape (flat, L, U or curved).
Layout Calculations
- Flat: Width = base length + overlap
- L-shape: Width = base length + base width + overlap
- U-shape: Width = base length + (2 x base width) + overlaps
- Curved: Width = ~75% of half-perimeter of base
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates. Always verify quantities before purchasing materials.