So in the newest chapter of NNT (172), Gloxinia sends Meliodas on a one way trip to nuke town.
This is gonna be a sort of tough one to scale, since there are serious depth issues with the explosion image and lack of things to scale at its end (since the explosion destroyed anything we might scale), so I will try to reason this out.
On this page, we see that Meliodas has been sent from the far right corner of the panel to the far left. What pops out about this is that he is not shown flying away at a degree, instead, it is shown as a completely flat line. This is important because Meliodas' starting point (far right) was actually the exact center of the maze, meaning he - at some point in his flight - crossed over the boundaries of the maze.
Now, we can only lowball this because we don't know the degree difference between this "flat panel" and the true flight path (meaning we are only dealing with one non-hypotenuse side of a right triangle), but one way we can tell is that he is past the maze is that he is already behind a mountain in this panel by around the halfway mark. So we can get a low end by simply using the distance from right to mountain-like rock formation and a high-end by using the other mountain-like rock formation instead. The first mountain like rock formation is significant because that is the place where the explosion stops . So the radius is the distance between the far left side of the screen and that first mountain, regardless of scalings.
So our steps will be:
1) Find radius of maze
2) Apply radius to distance from left side of panel to first mountain (high end) or second mountain (low end)
3) Find distance from left side to first mountain with those scalings and use in nuke calculator as blast radius (total fatalities)
Scaling 1:
Height of wall = 50 pixels = 300 feet = 91.44 meters
Height of rock = 340 pixels = 621.792 meters
Scaling 2:
Panel height = 1739 pixels
Rock height = 621.792 meters = 57 pixels
Degrees = 2atan(tan(70/2)*(57/1739)) = 2.6295 degrees
Plugging into angsize calculator, radius = 13,564 meters
Scaling 3:
Low end maze radius (green) = 13.564 km = 390 pixels
High end maze radius (red) = 13.564 km = 130 pixels
Low end blast radius (yellow) = 411 pixels = 14.294 km
High end blast radius (yellow) = 411 pixels = 42.883 km
Playing around with the nuke calculator, I get the following approximate values:
High end: 4175 megatons or 4.175 gigatons or Small Island level
Low end: 149 megatons or Mountain level
Somewhat consistent with the other feats.
Edit: WoG Radius of Maze[]
So actually, according to WoG, the maze is around 8 miles in radius . This makes this calc a lot simpler and so the only scaling that is now relevant is scaling 3. However, I will leave the first two scalings up because they are somewhat consistent with WoG in actuality (8 miles = 12.8748 km ~=~ 13,564 km). So:
Scaling 3:
Low end maze radius (green) = 12.8748 km = 390 pixels
High end maze radius (red) = 12.8748 km = 130 pixels
Low end blast radius (yellow) = 411 pixels = 13.568 km
High end blast radius (yellow) = 411 pixels = 40.704 km
Playing around with nuke calc:
High end: 3558 megatons or 3.558 gigatons or Small Island level
Low end: 127 megatons or Mountain level
Again, pretty consistent