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Plaster Calculator

Estimate plaster volume and cement/sand for wall or ceiling plaster thickness and mix ratio.

Estimates only — not professional financial, medical, legal or engineering advice. Read full disclaimer.

Result

Fill in the form and click Calculate to see your result here.

How it's calculated

Wet volume = area × thickness. Dry volume applies the handler’s bulking factor, then split by mix parts into cement and sand.

Example

Example: Plaster Calculator

Inputs

  • Wall Area: 100
  • Thickness: 12
  • Cement Ratio: 1
  • Sand Ratio: 6

Outputs

  • Cement Bags: 7
  • Sand Volume: 1.37
  • Wet Volume: 1.2

This example uses typical sample values. Adjust the inputs above to see how the results change for your own numbers.

About this calculator

Plaster is a thin but hungry layer. 12 mm on a whole house is cubic metres of mortar, not a “few bags.” This calculator uses area × thickness and a mix such as 1:4 or 1:6.

New brickwork sucks more mortar than a second coat. Door reveals and jams add area people forget on multi-storey Nepali houses. Combine with the brick calculator rather than guessing both.

Frequently Asked Questions

Cement and sand from plaster area × thickness, then a 1.33 dry-volume factor typical for plaster (bulking and waste) as documented on the handler. Enter the mix ratio the mason named (often 1:4 or 1:6).
Match the form (usually mm or metres as labelled). 12 mm internal vs 15–20 mm external changes sand/cement a lot.
No. Plaster uses 1.33 in this engine; concrete bags use 1.54. Do not mix the factors across tools.
If you plaster twice, run twice or increase thickness to the total coat build-up your spec uses.
Deduct doors/windows from wall area before entry if the field is gross wall.
Not included. Chemical coats are separate products.
Enter ceiling area as wall_area. Gravity waste may be higher — talk to the mason.
Cement bags are typically 50 kg; follow the result’s bag count if shown.
Quantity estimate only, not a plaster specification.
Bulking of wet sand is partly why dry factor exists; saturations still vary on site.

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Related Guides

How-To Calculators

Cement and Sand for Plastering: Quantity Guide

Estimate plaster cement and sand from wall area, thickness, and mix ratio—with wastage and dry-volume tips.

In this category

Construction Calculators

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