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Fileraz
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Fileraz
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Construction Calculator
Rule-of-thumb site math, reviewed October 2026 — first-pass material estimates, not a bill of quantities or a code check. Confirm with your contractor or engineer.
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Volume is wall area × thickness in millimetres ÷ 1000: 10 m² at 12 mm gives 10 × 12 ÷ 1000 = 0.120 m³. Millimetres-to-metres is the whole trick — 12 mm is 0.012 m, and entering 12 as metres would overstate the volume a thousand-fold, which is the error this page exists to prevent.
Enter the wall area and the specified thickness (often ~12 mm inside, 15–20 mm outside). The output volume is wet plaster; split it into cement and sand by your mix ratio — 1:4 and 1:6 are common — then add bulking and wastage on the dry materials, because a cubic metre of plaster needs well over a cubic metre of dry ingredients.
It does not split volume into cement and sand bags, add bulking or wastage, or verify the specified thickness suits the substrate — volume only, materials by your mix design.
Volume only — cement/sand split needs your mix ratio.
Internal plaster is often around 12 mm and external around 15–20 mm, but follow the specification for your job.
No — it gives volume. Split that by your mix ratio for materials.
Sand bulks and cement fills voids, so dry ingredients always exceed the wet volume — apply your mix's bulking factor on top.
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