# How Many Cement Bags Required in 100 Square Feet of RCC Slab? Calculation

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Update: April 11, 2024
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# How Many Cement Bags Required in 100 Sq Ft RCC Slab?

Total 7.6 bags cement each of 50 kg is required for 100 square feet rcc slab when the thickness of slab is 4 inch, and 10.5 bags cement is required when thickness of slab is 5 inch. Read the complete post to understand in detail.

## Cement Bags Required in 100 Sq Ft RCC Slab of 4 Inch

To calculate the number of cement bags required in 100 square feet slab of 4 inch thickness, we have some requirements and considerations in the slab.

### Requirements and Considerations for Slab

• Size of slab = 100 square feet
• Thickness of slab = 4 inch
• Shrinkage factor = 1.54 (54% extra of wet volume)

### Volume of Slab (Concrete Work)

Volume of slab
= Area of slab × Thickness of slab
= 100 square feet × (4 inch/12) feet
= 33.33 Cubic Feet
Hence, total volume of rcc work = 33.33 cubic feet (wet concrete).

### Dry Volume of Concrete

Total volume of dry concrete
= 1.54 × 33.33 Cubic Feet
51.33 Cubic Feet

### 1. Volume of Cement in 100 Square Feet Slab (M20 Grade Concrete)

Ratio of concrete (M20) = 1:1.5:3 (Cement : Sand : Coarse Aggregate)
Sum of ratio = 1+1.5+3 = 5.5
Volume of cement in 100 square feet slab
= (Ratio of cement/ Total ratio of concrete) × Total volume of dry concrete
= (1/5.5) × 51.33 Cubic Feet
9.33 Cubic Feet or 0.2642 m³
Since, density of cement is 1440 m³/kg
Hence, the weight of cement is 0.2642 m³ × 1440 kg/m³
= 380.4 kg or 7.6 Bags of cement each 50 kg

### 2. Volume of Cement in 100 Square Feet Slab (M25 Grade Concrete)

Ratio of concrete (M25) = 1:1:2 (Cement : Sand : Coarse Aggregate)
Sum of ratio = 1+1+2 = 4
So, Volume of cement in 100 square feet slab
= (Ratio of cement/ Total ratio of concrete) × Total volume of dry concrete
= (1/4) × 51.33 Cubic Feet
12.833 Cubic Feet or 0.3634 m³
Since, density of cement is 1440 m³/kg
Hence, the weight of cement is 0.3634 m³ × 1440 kg/m³
523.3 kg or 10.5 Bags of cement each 50 kg

## Cement Bags Required in 100 Sq Ft RCC Slab of 5 Inch

To calculate the number of cement bags required in 100 square feet slab of 5 inch thickness, we have some requirements and considerations in the slab.

### Requirements and Considerations for Slab

• Size of slab = 100 square feet
• Thickness of slab = 5 inch
• Shrinkage factor = 1.54 (54% extra of wet volume)

### Volume of Slab (Concrete Work)

Volume of slab
= Area of slab × Thickness of slab
= 100 square feet × (5 inch/12) feet
41.67 Cubic Feet
Hence, total volume of rcc work = 41.67 cubic feet (wet concrete).

### Dry Volume of Concrete

Total volume of dry concrete
= 1.54 × 41.67 Cubic Feet
64.17 Cubic Feet

### 1. Volume of Cement in 100 Square Feet Slab (M20 Grade Concrete)

Ratio of concrete (M20) = 1:1.5:3 (Cement : Sand : Coarse Aggregate)
Sum of ratio = 1+1.5+3 = 5.5
Volume of cement in 100 square feet slab
= (Ratio of cement/ Total ratio of concrete) × Total volume of dry concrete
= (1/5.5) × 64.17 Cubic Feet
11.67 Cubic Feet or 0.33 m³
Since, density of cement is 1440 m³/kg
Hence, the weight of cement is 0.33 m³ × 1440 kg/m³
475.2 kg or 9.5 Bags of cement each 50 kg

### 2. Volume of Cement in 100 Square Feet Slab (M25 Grade Concrete)

Ratio of concrete (M25) = 1:1:2 (Cement : Sand : Coarse Aggregate)
Sum of ratio = 1+1+2 = 4
So, Volume of cement in 100 square feet slab
= (Ratio of cement/ Total ratio of concrete) × Total volume of dry concrete
= (1/4) × 64.17 Cubic Feet
16.0425 Cubic Feet or 0.453 m³
Since, density of cement is 1440 m³/kg
Hence, the weight of cement is 0.453 m³ × 1440 kg/m³
652.32 kg or 13 Bags of cement each 50 kg

Note: This quantity just for reference and it is based on above assumptions and it may vary depending upon material type and other design changes.