Calculation of Modular ratio values for different grades of concrete

Grade of concrete Modular ratio M15 m = 280/3×5 = 18.66 M20 m = 280/3×7 = 13.33 M25 m = 280/3×8.5 = 10.98 M30 m = 280/3×10 = 9.33 It should be remembered that rounding off the modular ratio values is not permitted by Indian Standard.