In an earlier post, we have discussed how to calculate the material for concrete? & now we are going to see how to calculate the volume for trapezoidal footing volume along with an example.

Trapezoidal Volume Calculation Formula

The below formula is used to calculate 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 Typical Trapezoidal Footing Plan

Example Footing Calculation

Let us see an example.

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

Example Trapezoidal Footing Plan

Volume =  H/3 (A1+A2+(√A1 x A2)

A1 = 2 x 1.5 = 3 Sqm

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 m3

Volume (V) = 0.19 m3

You may be interested to know about the different types of foundations used in construction.



Bala is a Planning Engineer & he is the author and editor of Civil Planets.


  1. Please share derivation of the above formula. (Trapezoidal footing)

  2. Bottom cuboid volume is not considered in ready calculator???

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