#### How to calculate Quantity of slab Concrete

##### First we need to calculate concrete or slab volume

For example dimension is

Length = 15 Ft

Width = 12 Ft

Thickness = 0.5 Ft

Volume Formula is > Length × Width × Thickness

15 × 12 × 0.5 = 91 CFT

Slab Concrete Volume is = 90 CFT

Now we need to multiply dry volume to Slab concrete Volume

##### Formula > Wet volume × dry volume

The Dry Volume is = 1.54

Wet Volume is = 90 CFT

1.54 × 90 = 138.6 CFT

Dry Volume is = 138.6 CFT

**Now we will calculate the Quantity of Cement, Quantity of Sand and Quantity of Aggregate **

For example Ratio is 1 : 2 : 4

Sum of Ratio = 1 + 2 + 4 = 7

**Quantity of Cement **

Quantity of cement = dry volume × (1/7)

Quantity of cement = 138.6 × (1/7) = 19.8 CFT

Quantity of Cement in Bags = 19.8 × 40.7816 = 807.475 Kg

1 CFT Cement = 40.7816 kg

Total Cement Weight is = 807.475 Kg

1 Cement Bag Weight is = 50 kg

Quantity of Cement in bags = total kg of cement / 1 cement bag

##### Quantity of Cement bags = 807.475 / 50 = 16.14 bags

**Quantity of Sand**

Quantity of Sand = dry volume × (2/7)

Quantity of Sand = 138.6 × (2/7) = 39.6 CFT Sand

Quantity of Aggregates

Quantity of Aggregates = dry volume × (4/7)

Quantity of Aggregates = 138.6 × (4/7) = 79.2 CFT Aggregates

Very useful thanks