In this article, you will learn the Top Important Formulas used by Civil Engineer While working at Construction Site. Important Formulas aids you to calculate the quantity of material, shuttering work, Skirting work, Plastering Work, Painting Work, Cornice work, etc.

### Important Formulas

**Rectangle**

Length of Rectangle = L.

Breadth of Rectangle = B.

Height of Rectangle = H.

**Formula**

- Perimeter or Peripheral length (P) = L+ B +L + B =2 x (L + B).
- Area of Rectangle Cross-section = L x B.
- Area of Rectangle (A) = Peripheral Length x Height of Rectangle.
- Volume of Rectangle (V) = Area of Rectangle x Height of Rectangle.

**Applications**

- Calculation Shuttering Area of Rectangle column, Pile Cap, Rectangle Isolated Pad Footing etc.
- Volume of Concrete of Rectangular Column, Footing, Beam, Pile Cap, Slab etc.
- Skirting of Tile in Rectangular Column etc.

Read also:-How to Measure the Irregular Land/Plot in Katha, Dhur, Ropani, Bigha, Acre.

**Square**

Length of Square = L.

Breadth of Square = L.

Height of Square = H.

**Formula**

- Perimeter or Peripheral length of Square (P) = L + L+ L + L = 4L.
- Area of Square Cross-section = L
^{2}. - Area of Square (A) = Perimeter x Height of Square = 4L x H.
- Volume of Square (V) = Area of Square (A) x Height of Square.

**Applications**

- Calculation Shuttering Area of Square column, Pile Cap, Footing etc.
- Volume of Concrete of Square Column, Footing, Beam, Pile Cap, Slab etc.
- Skirting of Tile in Square Column etc.

**Circle**

Diameter of Circle = D.

Radius of Circle = r.

Height of Circle = H.

**Important Formulas**

- Perimeter (P) = 2 x π x r.
- Area of Circular Cross-section = π/4 x D
^{2}or π r^{2}. - Area of Circle (A) = Peripheral Length x Height of Circle.
- Volume of Circle (V) = Area of Circle x Height of Circle.

**Applications**

- Calculation Shuttering Area of Circular column, Circular Pile etc.
- Volume of Concrete of Circular Column, Circular Pile etc.
- Skirting of Tile in Circular Column etc.

Read also:- How to Measure the Land/Plot in Square Feet, Square meter, Acre, Kathaa, Dhur, Ropani, Aana, Kanma

**Semi-Circle**

Diameter of Circle = D.

Radius of Circle = r.

**Important Formulas**

- Perimeter (P) =1/2 x (Perimeter of Circle) = 1/2 x (2 x π x r).
- Area of Semi-circle = 1/2 x (Area of Circle) = 1/2 x (π/4 x D
^{2}).

**Triangle**

Breadth of Triangle = B.

Height of Triangle =H.

Inclined Length of Triangle = C.

Length of Triangle (L) = L.

**Formula**

- Inclined Length (C) =√ (B
^{2}+ H^{2}). - Perimeter = B + H + C.
- Area of triangle cross-section (A) = 1/2 x B x H.
- Area of Triangle = Perimeter x Length of Triangle.
- Volume of Triangle (V) = Area of Triangle x Length of Triangle.

**Applications**

- Calculation of shuttering area of Staircase Steps etc.
- Volume of Ramp, Staircase steps etc.

**Volume of Trapezoidal Footing**

Total Volume of Trapezoidal footing = Volume of Rectangular Part + Volume of Trapezoidal Part

**Volume of Rectangular Part**

Length of Footing = L

Breadth of Footing = B.

Depth of Rectangular part = d0

- Volume of Rectangular Part = L X B x d0.

**Volume of Trapezoidal Part**

Length of Footing = L1. Breadth of Footing = B1.

Length of Footing = L2. Breadth of Footing = B2.

Depth of Trapezoidal part = h

A1 = L1 x L2.

A2 = L2 X L2.

- Volume of Trapezoidal Part = h/3 x (A1 + A2 +√(A1 x A2)

**Area of Trapezoidal Section**

Area of Trapezoidal section (A) = 1/2 x (a +b) x h.

Peripheral Length (L) = a +b + c + d.

**Cone**

s = Slant height

r = radius

h = height of cone

- Total surface area of cone = Area of base + Lateral surface area.

= πr2 + πrs.

- Volume of Cone = 1/3 x π x r2 x h.

**Cube**

Length of cube = s.

Breadth of Cube = s.

Height of Cube = s.

In cube Length, Breadth & Height are equal.

- Volume of Cube = s x s x s = s3.
- Total Surface area of Cube = 6s
^{2}.

**Cylinder**

Height of cylinder = h.

Radius of cylinder = r.

- Total surface area of cylinder = 2πr2 + 2πrh.
- Volume of Cylinder = πr
^{2}h.

**Frustum**

Radius of upper base = r.

Radius of Lower base = R.

Slant height = s.

Height of frustum =h.

- Volume of Frustum = 1/3πh (r
^{2}+ rR + R^{2}). - Lateral Surface Area = π(r + R)s.
- Total surface Area = π(r +R)s + πr
^{2}+ πR^{2}

**Applications**

- To find out the volume of concrete for slump test.

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