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M20 Concrete vs. Other Grades M20 Concrete : Grade: M20 is a lower-grade concrete mix commonly used for relatively less demanding applications. Mix Proportions: It typically consists of 1 part cement, 1.5 parts sand, and 3 parts coarse aggregates by volume, with a water-cement ratio of around 0.5-0.55. Learn how to calculate and mix M20 concrete , a moderate-strength grade suitable for residential buildings and pavements. Find out the ratio , quantity, and quality of cement, sand, and aggregate needed for 1 cubic metre of M20 concrete . Learn how to calculate cement, sand, aggregate, and water for 1 meter cube of M20 grade concrete with a mix ratio of 1:1.5:3. Follow the step-by-step procedure and see the results in kg and liters. M20 ratio is widely used in reinforced concrete works due to balanced strength and durability. The structural integrity, load-bearing capacity, and weather resistance features of this mix depend on the cement, sand, and aggregate ratio .