**Step 1:- Assumptions**

Area of Plaster = 100 m²

Thickness of plaster = 15 mm =0.015 m

Mix Ratio → 1:4

**Step 2:- Volume of Plaster**

**∵Volume of plaster = Area of plaster x Thickness of plaster**

Volume of plaster = 100 x 0.015=1.5m³

**Add 20% extra Quantity for Filling of joints, Depressions & Wastage**

∴Volume of plaster = 1.5 + [ (20×1.5) /100 ] =1.5 + 0.30 =1.80m³

**Dry volume of plaster = Wet volume x 1.33**

(i.e., Addition of bulk moisture 33%)

Dry Volume = 1.80m³ x 1.33 = 2.394 m³

**Step 3:- Quantity of Cement**

**Quantity of Cement = (Dry Volume of plaster x Cement ratio) / (Sum of the ratio)**

Quantity of cement = (2.394 x 1) /(1+4)= 0.4788 m³

**∵Density of Cement = 1440kg/m³**

Weight of Cement = 1440 x 0.4788 = 689.472 Kg

**∵ 1 bag of cement contains 50 kg of cement**

Number of bags = 689.472 Kg/50kg =** 13.78 No’s**

**Step 4:- Quantity of Sand**

∵ Cement : Sand :: 1:4

**Quantity of Sand = Quantity of Cement x 4**

∴ Quantity of Sand = 0.4788 m³ x 4 = **1.9152 m³**

**∵ 1m³=35.3147 Cubic Feet (CFT)**

Quantity of sand = 1.9152 x 35.3147 = 67.634 CFT

#### Step 5:- Cost calculation

We have take labour constant from any of the country standard

I am taking labour constant as per INDIAN STANDARD 7272: PART1

**Summary:-**

Cost of material = Rs. 7408.52

Cost of labours = Rs. 21400

Sum of labour & material cost=** Rs. 28808.52**

**Add:-**

1.Water charge @ 1.5% = (1.5/100)x 28808.52 =** Rs. 432.127**

2.Contractor’s profit @10 % = (10/100)x 28808.52 = **Rs. 2880.852**

**Total cost = 28808.52 + 432.127 +2880.852= Rs. 32121.49**

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