Plaster Calculator Cement Bags 12mm

Plaster Calculator

Plaster cement and sand for 12 mm or 15 mm thickness — wall/ceiling area in sq ft or sq m, 1:4 mix.

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Internal plaster typically 12 mm; external or ceiling 15 mm. Ratio 1:4 cement-sand (IS practice).

About this tool

Estimate cement and sand for internal or external plaster in India. Enter wall or ceiling area, choose 12 mm (internal) or 15 mm (external/ceiling) thickness — get cement bags and sand for 1:4 mix. Free calculator for contractors billing plaster work and ordering materials.

How to use the Plaster Calculator

  1. 1

    Enter plaster area

    Total wall or ceiling area in sq ft or sq m.

  2. 2

    Select thickness

    12 mm or 15 mm.

  3. 3

    Review cement and sand

    See bags and sand m³ for ordering.

Frequently Asked Questions

12 mm vs 15 mm plaster?

12 mm standard for internal walls; 15 mm for external walls and ceilings.

How many bags per 100 sq ft?

Roughly 1.2–1.5 bags (50 kg) per 100 sq ft for 12 mm 1:4 plaster — varies with surface.

Include skim coat?

This estimates base plaster only — add separate line for putty or skim.

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