Plaster Cost Calculator
Find the cement, sand and total material cost for plastering a wall at a chosen mix ratio.
Enter your numbers
Example: 100
Example: 0.5
Example: 550
Example: 45
Example: 5
Recent
Formula
How the calculation works
The wet volume is the area times the thickness, and a dry-volume factor of 1.33 accounts for the voids that fill when sand and cement mix.
The dry volume is split between cement and sand by the mix ratio, and wastage is added on top.
Cement is converted to bags and sand priced by volume, and the two costs added give the material total.
Common mistakes
- Using the mix ratio wrongly, since 1:4 means one part cement to four parts sand, not the reverse.
- Skipping wastage, which on a rough wall can be several percent of both materials.
When to use it
- Use it to estimate cement and sand before buying for a plastering job.
- It is not a mix design; structural plaster may need a specified grade and strength.
Worked example
100 sq ft at 0.5 in thickness in a 1:4 mix with 5% wastage uses 0.95 cement bags and 4.65 cu ft sand, costing about 731.55.
Common questions
Why is the dry volume larger than the wet volume?
Cement and sand are bought dry, and the 1.33 factor plus wastage restores the quantity you must buy.
Which mix is best for walls?
1:4 is common for external walls and 1:6 for internal plaster.
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