Calculate the sand and cement needed for wall or ceiling plastering, based on the area, plaster thickness, and mix ratio.
How to Use the Sand Calculator
Enter the "Plaster Area (m²)" of the wall or ceiling.
Enter the "Plaster Thickness (mm)" - typically 12-15mm for internal walls.
Enter your "Mix Ratio" for Cement and Sand (e.g. 1:6 for internal plaster, 1:4 for external plaster).
Click "Calculate" to see the sand and cement required.
Frequently Asked Questions
Plaster mortar (cement + sand only, no coarse aggregate) typically uses a dry volume factor of around 1.33, compared to 1.54 for concrete mixes that include aggregate - both account for voids and bulking, but the exact factor depends on the mix composition.
A 1:6 (cement:sand) ratio is common for internal wall plastering, while a richer 1:4 ratio is often used for external plastering, which is more exposed to weather.
This tool is tuned for plastering (cement + sand only). For concrete mixes that also include coarse aggregate, use the Cement Calculator instead, which handles the three-part cement:sand:aggregate ratio.
Yes, it's completely free and requires no sign-up.