The following video will give you excellent guidance if want to learn how to calculate the number of bricks, cement and sand quantities in a brick wall.
The ratio of mortar is taken as 1:6 (1 = cement and 6 = sand).
The density of Mortar is taken as 10mm.
To determining the quantity of sand constants are as follow:
Density of cement = 1440 kg/m3
1 m3 = 35.3147 ft3
Size for Modular Bricks :
Volume of 1-Brick (Devoid of taking Mortar) is taken as .19 m x .09 m x .09 m = 0.001539 m3
Volume of 1-Brick (Including Mortar i.e. 10 mm thickness of mortar will be increased) is taken as 20 m x 10 m x 10 m = 0.002 m3
Watch the video:
Video Source: TECH@7K
