How to calculate  Cement and sand quantity in plaster

it should be noted that for wall plaster the cement to sand ratio generally 1:6

the total volume of plaster is equal to Area of wall* thickness of plaster = 300*0.042=12.6cft .

Quantity of cement is equal to Ratio of cement/total ratio *dry volume which is equal to 1/7*17=2.42cft

the volume of sand is equal to 6/7*17=14.57cft

t50/1440=0.0347m^3. this is the volume of 1 bag cement 

volume of cement bag in cft = 0.0347*35.314=1.225 cft or 1.25cft

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