Plaster Calculator
Calculate cement and sand quantities needed to plaster a wall to a given thickness.
Estimates only — not professional financial, medical, legal or engineering advice. Read full disclaimer.
Calculating...
Result
Fill in the form and click Calculate to see your result here.
How it's calculated
Wet volume = Wall Area × Plaster Thickness. Dry volume = Wet Volume × 1.33. Cement and sand volumes are split according to the cement:sand ratio, and cement volume is converted to bags at 50kg per bag.
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
The Plaster Calculator estimates the cement bags and sand volume required to plaster a wall, based on the wall area, plaster thickness and cement:sand ratio, using the standard 1.33 dry-volume factor typical for plaster work.
Frequently Asked Questions
12mm is standard for internal wall plastering, while external walls often use 15-20mm. Adjust the thickness field to match your project's specification.
Plaster mixes typically use a 1.33 dry volume factor rather than concrete's 1.54, reflecting the finer sand-cement mix's different bulking behavior.
A 1:6 ratio is common for internal plaster, while 1:4 is common for external plaster. The calculator defaults to 1:6, adjustable to your specification.
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