What is the Plaster Calculator?
Plastering needs the right amount of cement and sand. Enter the wall area and plaster thickness, choose a mix ratio, and get the number of 50 kg cement bags and the sand in cubic metres and cubic feet. The tool adds 30% for dry volume and 20% for wastage and uneven surfaces.
How to use the Plaster Calculator
- Enter the area (length × height, or total area).
- Pick the thickness: 12 mm for inside walls, 15–20 mm for outside, 6 mm for ceilings.
- Choose the mix ratio and read the materials.
Common mixes
- 1:3 – external or waterproof plaster
- 1:4 – external walls
- 1:5 / 1:6 – internal walls
- 1:3 – ceilings
This Plaster Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.
Last updated: · By NodifyTech