Terrain Calculator — Scenic Material Quantities

The calculator estimates terrain material volume based on your base area, maximum terrain height and a coverage factor for the terrain type.

Formula

• Foam fill volume = Base area × Max height × Coverage factor
• Flat terrain uses ~10% fill, rolling hills ~30%, rugged ~50%, urban ruins ~40%, trenches ~35%
• Plaster weight = volume × density. The default 1.2 g/cm³ assumes lightweight modelling filler or microsphere-loaded paste. Solid cured plaster of Paris is heavier at ~1.5–1.7 g/cm³ — raise the Plaster Density advanced option if you are mixing real POP, or it will under-order weight.
• XPS foam sheets are counted from the fill volume against a real sheet volume (standard 600×600mm hobby sheet × your chosen thickness), and floored at the number of stacked layers needed to reach the terrain height — so a tall, narrow build is never under-counted.
• PVA and sand/scatter figures (0.15 ml/cm² and 0.3 g/cm²) are rule-of-thumb basing rates and vary with how thickly you texture.