so, the size of new york is 783,8 km² and the blast dwarfed it to make it look like a few (5) pixels long, which are 5 millimeter long,
so (5x5)^2 = 625 mm^2

783, 8 km2 / 625 mm^2 is 1254080 so the blast was 1254080 time bigger than New york

the radius of New York is around 30 miles or 32.18 Kms

1254080 x 32.18 Kms =40356294.4 Kms

(((40356294.4/0.28)^3)/1000)/2 = 1.4970274e+21 megatons of tnt

Are you actually measuring the pixels? Just need the scale of reference and the pixel, no need to any third party scale. Do you have a picture scaling the map?

So, how can you scale the explosion if there's no picture to scale? If it was stated that the explosion covered NY then get the equivalent radius and obtain the yield.

So is this: NY has a length of x times larger than a pixel, so the explosion has a length x times larger than NY's. Then just find the length of NY and compare it the the pixel (whose side is 5 mm).

Welp, mathecally is good. However, what you got there is an explosion whose diameter is 28.5 times larger than sun's circumference, and don't thinknthat at that point is equation is no longer valid. I honestly think that the one who di write that didn't known about the size of NY... or a pixel... or sun.

I need some help with two calcs, the first one is about Katana blocking bullets with her sword, I left a comment explaining why I think these calcs are shit, and since you evaluated this blog before, I want you to answer the questions in my comment.

As for the calculation, where is the 95000 cc coming from? Always though volume of a 72 kg people would be around 68000 cc. And you haven't corrected the speed*mass stuff.

That calculation is for explosions made at ground level, and airburst explosion can also wipe certain level of surface. Since there's a few calcs that do not specify the type of explosion we always go with the low end.

It depends of how someone perform the attack, but generally we always use the airburst formula. Actually, is the surface formula listed in one of the policies pages?

Generally, anything that produce a shockwave is considered Mach 1, although that is not necessary true (20 psi shockwaves travel at Mach ~0.5). I do not calculate speed of explosions, but similar to non natural lightning/electricity, I wouldn't consider any explosion as fast as the one of tnt or c4.

But i'm not using the detonation speed of something like C4, which is 8050 m/s, i'm was using the supposed average speed of solid explosives which should regularly reach speeds of 3000 - 4000 m/s.