The Female Titan is 14 m tall
14 m / 226 px = 0.06 m/px
0.06 x 100 px = 6 m
6 / 743 px = 0.008 m/px
0.008 x 541 px = 4.328 m
0.008 x 37 px = 0.296 m
The hole she made is relatively rectangular so the basic formula should be fine.
4.328 x 0.296 x 14 = 17.94 m^3 = 1.794e+7 cm^3
1.794e+7 x 8 = 1.4352e+8 J
Small Building level
Not bad for an attack she visibly took very little damage from, and consistent with the higher ends of Titan Shifters' AP being 9-A+