Here is again a great video tutorial by L & T youtube channel about how to calculate cement and sand quantity in plaster.

Plaster is a building material used for coating walls and ceilings. Sand-cement plaster is used extensively in building work as a decorative or protective coating for concrete and masonry walls.

Plaster is one of the oldest building materials, the most primitive form was mud plaster, used to hold together structures made of branches or wood for example. Today internal plastering is used more as a way of smoothing out surgaces and preparing them for decoration, it also adds strength to the wall or ceiling and helps seal together building materials.

Specifications:

Plastering : Internal plastering with double coat cement plaster with putty finish & external plastering with double coat sand-faced cement plastering with putty finish.

In this video you will get a detailed process of calculating sand and cement for a plaster job.