# Plaster Calculator

Build a surface schedule and estimate plaster mix materials.

[Open this tool](https://whatson.pk/plaster-calculator/)

Category: Construction

Plaster quantity depends on the surface you will coat and the finished thickness. Room floor area is a poor substitute for those measurements.

Build a surface schedule, deduct openings from the correct face and choose the number of faces. Check the mix proportions against the work specification.

## Inputs and controls

* Measurement unit: Feet; Metres; Inches; Centimetres; Millimetres
* Plaster thickness (mm). Allowed range: 0.1 to 100
* Faces per surface. Allowed range: 1 to 2
* Openings per face (sq ft). Allowed range: 0 to 10000000
* Sand parts per cement part. Allowed range: 0.001 to 100
* Dry volume factor. Allowed range: 1 to 3
* Bag mass (kg). Allowed range: 1 to 1000
* Cement density (kg/m³). Allowed range: 100 to 5000
* Ordering allowance (%). Allowed range: 0 to 100. Added once to the measured requirement.
* Cement bag price (PKR / bag). Allowed range: 0 to 1000000000. Optional. Enter your own supplier quote.
* Sand price (PKR / cft). Allowed range: 0 to 1000000000. Optional. Enter your own supplier quote.
* Room
* Length. Allowed range: 0.001 to 100000
* Width. Allowed range: 0.001 to 100000
* Quantity. Allowed range: 1 to 1000

## How to use

* Choose measurement unit. Enter plaster thickness, faces per surface and openings per face.

* Enter sand parts per cement part, dry volume factor, bag mass, cement density and ordering allowance.

* Enter cement bag price and sand price.

* Add the entries in surface schedule as separate rows. Include room, length, width and quantity for each row.

* Select Calculate estimate. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.


## Why use this tool

A surface schedule helps you see which walls are included and prevents a door deduction from being applied twice.


## Before relying on the result

Deduction is applied to one face before multiplying by the number of faces.


## Tool limitations

Deduction is applied to one face before multiplying by the number of faces.

## Questions

### Should an opening be deducted for every face?

The tool deducts it from one face before multiplying by the face count. Enter the same measurement basis throughout the surface schedule.

### What should I check before using Plaster Calculator?

Check Measurement unit, Plaster thickness, Faces per surface and Openings per face. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified (UTC): 2026-10-01T14:08:57+00:00

This profile describes the tool. It does not execute it or supply a professional certification.