Calculating volume of 50 kg cement bag is very simple and easy. You just need to know the unit weight of cement.
Unit Weight (Density) of Cement in loose condition = 1440 kg/m3
We know that, Density = Mass/Volume
Therefore, Volume = Mass/Density
Mass of 1 Bag cement = 50 Kg
Volume in Cu.m = 50/1440
= 0.034722 Cu.m
Converting Cu.m to Cft. by multiplying 35.3147
Volume in Cft = 0 .0347 x 35.314 = 1.22539
= 1.225 Cft.
Volume in Liters = 0.034722 x 1000 = 34.722 Lit.
i.e., 35 Liters