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Usually for Plaster quantities get in units ( SM/SFT or Sqr.Yard)
Material Calculation Method:
For Example:
Plaster Ratio (1:6)
Solution:
Unit of Rate :10.00 Sq.M
Thickness of Plaster :2 cm
Wet Vol of Mortar :10x2/100 =0.20 Cu.M
Dry Vol of Mortar : 0.20 x1.27 =0.254 Cu.m
Ratio of mortar :1:6
Sum of Ratio :1+6 =7
Material Required:
1. Cement Qty :1/7 x0.254 =0.036 Cu.M
:0.036 /0.035 =1.02 bags
2. Sand Qty :6/7x0.254 =0.22 Cu.m
Usually Plastering has the following calculations.
Cement = {1 / (1+6)} x {1.25 x1.25} x {1440 /50} ==6.5 Bags
Sand = {6 / (1+6)} x {1.25 x1.25} x1.07 ==1.4 Cum
While calculating, it is multiplied by25 % each to compensate Dry to Wet volume conversion & for wastage part (some companies use lesser or higher percentages also) and1440 is density of cement and divided by50 to get the answer in bags.
While calculating sand, additionally7% is added to compensate bulking of sand.