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The mix proportion for M40 concrete is 1:1.65:2.92W/C ratio = 0.4The design calculation is as per IS mix design
In this M refer to Maximum compressive strength and 20 refer that concrete that with stand upto 20KN compressive strength.
upto M25 it is nominal mix but after that are the design mix which need to becalculated.....
The ratio of cement, sand and crushed stone in M 25 grade concrete is 1:1:2.In this grade of concrete a compressive strength not less than 25 N/mm2 is achieved in 28 days.
Volume componentsGrade 20 concrete 1:2:4 (cement:sand:aggregate)Grade 25 concrete 1:1.5:3 (cement:sand:aggregate)Grade 30 concrete 1:1:2 (cement:sand:aggregate)See related link below for more info