# Tips to compute the quantity of cement, sand and aggregate in concrete & water cement ratio

In this construction video tutorial you will learn how to work out the quantity of cement, sand and aggregate in concrete and water cement ratio.

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.

Video Source: Parag Pal