What is the meaning of M10,M15,M20 concrete?

As per Indian Standard IS 456:2000, the Code of practice for  Plain and Reinforced Concrete.

Letter M represents mix (concrete mix) and the number followed after M represents the compressive strength to be attained in N/sq.mm  at 28 days age when a standard cube of  150x150x150 mm is subjected to standard  compressive test. Both combinedly termed as Grade of Concrete.

Thus, a concrete of M30 grade should attain a compressive strength of  30 N/sq.mm at 28 days age.

Units/SI

N= Newton, for easy understanding 1 N= 100g considering gravity

mm= millimeter

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