Formula for Volume of Trapezoidal footing

1.       1. Volume of Trapezoidal footing = LxBxD + h/3 (A1 +A2 + Under root of A1 A2)

                                          Or

       Volume of Trapezoidal footing = LxBxD + h/6 (A1 +A2 + 4Am)

       Where L= Length, B= width, D=Bottom Depth, H=Height of Trapezoidal footing

        A1= Bottom area, A2= Top area, Am= Mean Area