To do it, you should have clear conceptions on the following items :-
Grades of concrete Mix Ratio
M10 - 1:8:6
M15 - 1:2:4
M20 - 1:1.5:3
M25 - 1:1:2
Here, M means Mix and number means the compressive characteristics strength of concrete in 28 days.
Water Cement Ratio :- Grade of cement Water per bag (50 kg) cement (weight of 1 bag cement is 50 kg)
M5 - 60 litre
M7.5 - 45 litre
M10 - 34 litre
M15 - 32 litre
M20 - 30 litre
For calculation purpose, wet volume of concrete = 1 m3
Dry volume = 54% increase by weight volume
Wet volume = 100% + 54% = 154%
In order to covert it to numbers, just divide by 100
154/100 = 1.54
So, dry volume is 1.54 x wet volume
Now, you have to provide the density of cement, fine aggregates and course aggregates as follow :-
Cement = 1440 Kg
Fine Aggregate = 1450 to 1600 Kg/m3
Course Aggregate = 1450 to 1500 Kg/m3
Now, on the basis of the above dimensions, you can start calculation for the different grades of concrete. To know the detailed calculation process, watch the following video tutorial.