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As per BS 8500-2 British/European standards The grade of concrete is denoted as C10, C15, C20, ... High Strength Concrete Grades : M50 : Design Mix : 50 MPa : 7250 psi : M55 : Design Mix : 55 MPa : 7975 psi : M60 : Design Mix : 60 MPa : 8700 psi : M65 : Design Mix : 65 MPa : 9425 psi : M70 : Design Mix : 70 MPa : 10150 psi : Read More: HOW TO CALCULATE COST OF CONCRETE WORK. The .