User blog:Gwynbleiddd/Bleach calc - Ichigo's unnamed Getsuga Tenso

Panel height = 809 px

Urahara = 26 px = 1.83 m

depth = at least 114 px = 8 m

Object = 2atan(Object_Size/Panel_Height/(tan(70/2))) = 2.58 degrees

distance = 40.6 m

I'll assume that the φ angle is 30 degrees (π/6 rad), so the other two angles (being equal) are 75 degrees each.

tan(75) = distance/(base/2)

base = 2*distance/tan(75)

base = 81.2/3.73

base ~ 21.8 m

Surface area = 1/2*base*height = 442.54 m^2

Volume of triangular prism = Surface area*depth

V = 442.54*8

V = 3540.32 m^3

Using pulverization (214 j/cc)

E = 7.57*1011 Joules (181 Tons of TNT) Multi-City Block level

Note: The depth may be higher since i scaled only what isn't covered in smoke/dust so the true result is possibly higher (up to 2 times the above number, still 8-A though).

And Urahara said that without his shield he would have lost an arm.