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Estimate plaster mortar for walls and ceilings — wet/dry volume, cement bags, sand and optional cost. Interior/exterior presets suggest transparent defaults; thickness and mix stay editable.
Last updated: Aug 2026
V_wet = A_net × T · V_dry = V_wet × 1.33 · cement_kg = V_dry × (c/Σ) × 1440 × (1+w%)
Net area deducts openings. Dry factor 1.33 and cement density 1440 kg/m³ match the cement/sand mortar path. Presets only suggest thickness and mix — both remain editable.
Estimate plaster mortar for walls and ceilings: wet volume, dry-volume adjustment, cement bags, sand and optional cost. Interior/exterior presets suggest transparent defaults you can edit. Indicative only.
Example: 100 m² interior wall, 12 mm thick, 4 m² openings, mix 1:4, 10% wastage. Net area = 96 m². Wet = 1.152 m³. Dry = 1.152 × 1.33. Cement ≈ 1/5 of dry × 1440 × 1.10; sand ≈ 4/5 of dry × 1.10.
Net area = gross plaster area − openings. Wet volume = net area × thickness. Dry volume = wet × 1.33. Cement and sand split by the cement:sand mix (e.g. 1:4), with cement mass at 1440 kg/m³, then wastage.
They only suggest a common thickness and mix (e.g. interior wall 12 mm @ 1:4). Assumptions are listed on the result. Thickness and mix stay fully editable — presets never lock values.
Enter total opening area, or count × width × height. Opening area is deducted from the gross wall/ceiling area before thickness is applied.
This calculator focuses on plaster coats with openings and surface presets. The cement and sand calculators share the same dry-factor and mix conventions for cross-checks.