Plaster Calculator

Length (m)

Length of the wall

Height (m)

Height of the wall

Select mix ratio

Thickness (mm)

The thickness of plaster

Area (m2)

Calculated wall area

Sand (m3)

The volume of Sand required

Cement (Bag 50kg)

$0.00

Number of cement bags required

NB: While all information in the calculator is supplied in good faith, no liability can be accepted by Civilconsctructiontools.com  team as actual use is beyond its control.
Remember to add 5% wastage to your quantities.

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Calculation example

Let say we want to estimate the quantity of materials required for a wall with Length (L)=12 m and Height (H)=2.6 m. The plaster thickness is taken as t= 15mm and mix ratio as 1:4.
Wall Area (A)                   = L x H
                                       =12×2.6
                                       =31.2 m2
Mortar wet Volume (Vw)= A x t
                                       =31.2 x 15/1000
                                       =0.468 m3
To convert from wed to dry volume , we must increase the wet volume by 33%. Add 25% allowance to fill up  uneven wall surface and joints.
Dry volume (Vd)             = Vw x 1.33 x 1.25
                                       = 0.468 *1.33 x 1.25
                                       = 0.778 m3
Mix ratio total  1+4 =5
Cement part=1
Sand part    =4
Dry sand volume = (Vd* Sand part)/total ratio
                            = 0.778 x 4/5
                            = 0.622 m3
Cement Volume  = (Vd* Cement part)/total ratio
                           = 0.778 x 1/5
                           =0.156 m3
The density of cement is 1440 kg/m3 
Number of cement bags of 50 kg required for 1m3 =1440/50
                                                                    =28.8 Bags
Volume of one Cement bags = 1/28.8
                                               =0.0347 m3
You could also just say  50/1440 =0.0347 m3 

Number of cement bags required= 0.156/0.0347
                                                      = 4.5 Bags
That’s all!

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