### How to Calculate the Quantity of Plaster | How to Calculate Quantity of Cement, Sand and Water For Plastering

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**HOW TO CALCULATE THE QUANTITY OF PLASTER**

To find the quantity of plaster is very easy just we required your very few minutes. The below points always are helpful to everyone at the site when you are required to calculate the plaster quantity (water, cement, and sand).

Plaster generally ratio used in construction = 1: 6 (1 part of cement and 6 part of sand).

Roof plaster ratio use = 1: 4

The thickness of the plaster is between =12 mm - 15 mm.

For a Better understanding please see below

**Example**

Suppose the plaster area is 200 square meters ( Length 20m and wide 10)

The ratio of plaster 1: 4 and the thick plaster is 13 mm.

We have to calculate the quantity required of water, Cement, and Sand.

**Available Data**

Plaster Thickness = 13 mm = 0.013 m we know 1 m = 1000 mm

Area = 200 square meters

Ratio = 1: 4

Quantity =?

**Solution**

First,

The volume of cement mortar required = (Area x Thickness)

The wet volume of cement mortar = 200 x 0.013

The wet volume of cement mortar required = 2.6 cubic meter

Dry volume is 35% more than wet volume so 2.6+(35%×2.6)=3.51 cubic meter

Sum of ratio 1+4=5

**Cement Required**

Required Cement = (Dry volume x Ratio of plaster x Density cement) / Sum of ratio

Cement = (3.51x1x1440) / 5 (Density of cement 1440 kg/meter cube)

Cement volume = 1010.88 kg / 50 (1 bag of cement = 50 kg)

Cement in bags = 20.21 bags

**Sand Required**

Sand volume = (Dry volume x Ratio x 35.3147) / Sum of ratio

Sand volume = (3.51 x 4 x 35.3147)/5 (1-meter cube = 35.3147 cubic feet)

Sand volume = 99.16 Cubic feet

**Water Required **

Water volume = (Weight of cement x water-cement ratio)

Water = 1010.88 x 0.5 (0.5 kg water in 1 kg of Cement)

Water = 505.4 kg or 505.4 Litters

**Material Summary**

Cement = 1010.88 kg

Sand = 99.16 cubic feet

Water = 505.4 Litters

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