The mix ratio for M20 concrete is typically 1:1.5:3, which means: 1 part cement, 1.5 parts sand & 3 parts aggregate (usually coarse aggregate). To calculate the quantity of materials for 1 cubic meter of M20 concrete, you would need: Cement: 1 part (by volume), which is 1440 kg/m³ in density (assuming ordinary Portland cement). Sand: 1.5 parts (by volume), typically around 1600 kg/m³ in density. Aggregate: 3 parts (by volume), usually ranging from 1400 to 1600 kg/m³ in density, depending on the type of aggregate used.

M20 is the medium strength concrete mix suitable for reinforced foundation, footing, slab casting, light duty house floor, slabs, paths, patio, driveway, steps, garage floor and all types of residential construction.

In M20 concrete mix, M stands for Mix and numerical figure 20 is overall characteristics of compressive strength measured in N/mm^2. Grades of concrete are defined by its compressive strength and composition of the concrete- cement water ratio, amount of Sand and aggregate, and the minimum strength the concrete should have following 28 days of initial curing after construction.

Characteristic strength of concrete is their compressive strength which can be determined by axial compression test on cubic concrete block or cylinder shape. If Compression test is carried on cubic concrete block, when tested with cube size 15cm × 15cm × 15cm, that’s known as Cubic test and their strength is called cubic strength.

To prepare 1 cubic meter of concrete, you would need 1.54 m3 of dry ingredients such as cement, Sand, stone and water. Let’s know about dry and wet volume of concrete, your given 1m3 of concrete is wet volume. For converting wet volume of concrete to dry volume of material mix we multiply it by 1.54.

From where 1.54 will come come, when water is poured in cement, sand and aggregate mixture the volume of dry mixture is reduced to some extent. % of voids due to fine aggregate is about 20%, % of voids due to course aggregate is about 34%, so total void percentage is about 54%.

As per calculation, we have to add 54% extra to get the dry volume of the concrete. So, dry volume of concrete for 1m3 would be 1.54m3 (dry volume = 1m3 of wet concrete + 54% of wet concrete volume = 1.54m3.

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**M20 concrete ratio for 1 cubic meter in kg**

The common nominal concrete mix ratio to create M25 concrete is 1:1.5:3:0.55. This means, 1 part of Portland cement mixed to 1 1/2 parts of sand, 3 parts of stone and 0.55 parts of water by volume. If you measure components of concrete by bucket, so, one bucket of cement will mix with 1 1/2 bucket of sand, and 3 bucket of stone.

The Mix ratio of M20 concrete for 1 cubic meter in kg, 1 part cement equals 403 kg or approximately 8 50 kg bags of cement mixed with 1.5 parts sand, or 672 kg sand mixed with 3 parts stone, or 1218 kg aggregate mixed with 220 litres Water.

The mix ratio of M20 concrete for 1 cubic meter is **1:1.5:3:0.55** (cement : sand: aggregate: water). This means that **1 part cement** (403 kg or about **8 bags of 50 kg cement**) mixed with **1.5 parts sand (672 kg sand)** mixed with **3 parts stone (1218 kg aggregate)** and about **220 liters water** gives 1 m3 concrete M20.

The quantity of cement required for one cubic meter of M20 concrete:- 1) Total dry volume of concrete = 1.54m3, 2) Density of cement = 1440 kg/m3, 3) Weight of cement bag = 50kg, 4) Total proportion = 1+1.5+3 = 5.5, so parts of cement in mix = 1/5.5, 5) cement quantity in m3 = 1.54×1/5.5 = 0.22 cubic metres, 6) cement quantity in kg = 0.22 m3 × 1440 kg/ m3 = 403kg, 7) cement quantity in bags = 403kg / 50kg = 8 bags of cement.

The quantity of sand required for one cubic metre of M20 concrete:- 1) Total dry volume of concrete = 1.54m3, 2) Density of sand = 1600 kg/m3, 3) Total proportion = 1+1.5+3 = 5.5, so parts of sand in mix = 1.5/5.5, 4) sand quantity in m3 = 1.54× 1.5/5.5 = 0.42 cubic metres, 5) sand quantity in kg = 0.42 m3 × 1,600 kg/ m3 = 672kg.

The quantity of aggregate required for 1m3 of M20 concrete: 1) Density of sand = 1450 kg/m3, 2) Total proportion = 1+1.5+3 = 5.5, so parts of aggregate in mix = 3/5.5, 3) aggregate quantity in m3 = 1.54× 3/5.5 = 0.84 cubic metres, 4) aggregate quantity in kg = 0.84 m3 × 1,450 kg/ m3 = 1,218kg.

The quantity of water required for 1m3 of M20 concrete: water cement ratio = 0.55, so, amount of water needed per m3 of M20 concrete = 403 × 0.55 = 220 litres.

To prepare 1m3 of M20 concrete with nominal 1:1.5:3:0.55 mix ratio (1 cement: 1.5 Sand: 3 aggregate: 0.55 water), you would need approximately 8 bags of 50kg cement (total 403kg), 672 kg of Sand, 1218kg of Stone and 220 litres of water.

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**Conclusion:**

M20 concrete ratio for 1 cubic meter is 1:1.5:3:0.55. This means, 1 part of cement (403kg or about 8 bags of 50kg cement) mixed to 1.5 parts of Sand (672kg of Sand) to 3 parts of Stone (1218 kg aggregate) and about 220 litres of water to yield 1m3 of M20 concrete.