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

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