How tall should a diorama backdrop be?

As a rule, the backdrop height should be at least 1.5 to 2 times the height of your tallest model element. For 1:35 scale, 150-250mm works well. Too short and the top edge is distractingly visible; too tall wastes material.

What material should I print my backdrop on?

Matte photo paper (200-250gsm) gives the best results. Glossy paper causes reflections. You can also use thin card (250gsm) for a stiffer backdrop. Print at 300 DPI minimum for close-up photography.

Where can I find diorama background images?

Stock photo sites, Google Earth screenshots (for personal use), or dedicated diorama backdrop services. Some modelling magazines include printable backdrops. You can also paint your own on card or canvas.

ModelCalcs.uk

Background Calculator — Backdrop Panels & Print Size

Size backdrop panels and calculate print dimensions for your diorama background.

Base Length

Side-to-side width of the diorama base — the wall the backdrop sits behind

Base Width (depth)

Front-to-back depth of the base — the L and U shapes wrap the backdrop along these sides too

Backdrop Height

How tall the printed backdrop stands — aim for 1.5–2× your tallest model element

Backdrop ShapeFlat = one panel; L wraps two sides at a corner; U wraps three sides; Curved sweeps around the base

Add overlap at joins

Adds 20mm where panels meet for gluing (one join on L, two on U). A single flat panel has no join, so nothing is added.

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 (single panel, no join so no overlap)
L-shape: Width = base length + base width + overlap
U-shape: Width = base length + (2 x base width) + overlaps
Curved: Width = depth ratio × approximate full perimeter of the base ellipse (default 0.75), where the perimeter is approximated as π × (length + width) ÷ 2

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify quantities before purchasing materials.