Found an error in this calc, so i'm remaking it (Size was drawn inconsistently betweeen the two shots). Most of this is a copy paste, except the part about the small windmill
Scaling the front door[]
The front door is 709 px to Alicia's 427, so the door is 1,6604215456674473067915690866511 times taller. Alcia is 159 cm, so the door is 264,00702576112412177985948477752 cm.
Destruction of the big windmill[]
Calculating the destroyed part as a half ellipsoid + cylinder
Ellipsoid[]
Radius = Width = 26 px
Height = 45 px
Calculator here gives me 127104,44055112441 px^3
So 63.552,220275562205 px^3
Cylinder[]
Using an average between the maximum and minimum height.
Average height = (51+8):2 = 29,5 px
Radius is again 26 px
Volume is 62.674,85714285709 px^3
Total volume[]
Total Volume (No hollowness) = 63.552,220275562205 + 62.674,85714285709 = 126.227,077418419295 px^3
Assuming hollowness of 80%, Volume is 25.245,415483683859 px^3.
The door here is 29 px, so 1 px = 9,1036905434870386820641201647421 cm
Volume (cm^3) = 25.245,415483683859*(9,1036905434870386820641201647421^3) = 19.047.368,429818551770471999697725 cm^3
Destruction of the small windmill[]
Volume of the windmill (If it was a perfect cylinder)[]
Windmill is 515 px tall and 195 px wide
Thus the theoretycal volume would be 61546178,571428515 px^3
Accounting for hollowness -> 12.309.235,714285703 px^3
Finding the missing part[]
Missing part has one side 209 px tall, one side 90 px tall, and two sides 0 px tall. We need to calc the missing part compared to a cylinder 209 px tall.
Average Height = (209+209+209-90+0):4 = 134,25 px
Radius is 195 px, so volume is 16043833,928571414 px^3
Accounting for hollowness 3.208.766,7857142828 px^3
Missing part is 26,067961165048543914110160475728% of the volume of the cylinder (Relevant for later)
Volume after being destroyed[]
Volume of the cylinder= 14402560,857142845 px^3
Volume of the cylinder (With 80% hollowness) = 2880512,171428569 px^3
Average Height = (210+228+129*2):4 = 174 px
Radius = 121 px
Volume of the windmill (No hollowness) = 8006535,428571422 px^3
Volume of the windmill (80% hollowness) = 1601307,0857142844 px^3
Volume of the missing part is 55,591054313099042775781924073886%
Volume of the destroyed part= 55,591054313099042775781924073886-26,067961165048543914110160475728 = 29,523093148050498861671763598158%
As above, 1 px = 9,1036905434870386820641201647421 cm
Volume of the cylinder (With 80% hollowness) = 2173312482,4678239990956831267108 cm^3
Volume of the destroyed part = 641.629.068,59718434644593380508821 cm^3
Total Volume destroyed[]
641629068,59718434644593380508821 + 19047368,429818551770471999697725 = 660.676.437,02700289821640580478594 cm^3
Applying fragmentation (8 j/cc) -> 5.285.411.496,2160231857312464382875 J or 1,2632436654436001877942749613498 tons of TNT Building level+