Trapezoidal footings are sloped footings. They are designed and constructed with great care to see that the top slope of 45 degrees is maintained from all sides.

**Trapezoidal Volume Calculation Formula**

The below formula has used for calculating the volume of the trapezoidal footing.

- V = H/3 (A1+A2+(√A1 x A2)
- A1 = Area of Lower Portion
- A2 = Area of Upper Portion
- H = Height of trapezoidal portion

**Trapezoidal Footing Volume – Example Calculation**

Let us see an example.

Refer below the Diagram. Now we are going to calculate the volume of the trapezoidal footing.

**Volume = H/3 (A1+A2+(√A1 x A2)**

- A1 = L*B
- A1 = 2 x 1.5 =
**3 Sqm** - A2= l*b
- A2 = 0.5 x 0.3 =
**0.15 Sqm** - H = 0.15m

Now Volume = 0.15/3 x (3+0.15+(√3 x 0.15)

- = 0.05 x (3.15+0.67)
- = 0.19 Cum

**Volume (V) = 0.19 Cum**