My Hero Academia: The Final Smash Calculation

[TheRustyOne]

Alright, time to bite the bullet and discuss what calculation we're going to use for Izuku's Final Smash during the Final War Arc.

In My Hero Academia Chapter 423-424, Izuku throws a powerful punch that splits apart the storm clouds above him.

The most biggest effect of this Smash is that it reached the USA and changed the weather. What should've been a week of stormy weather became a week of clear skies.

The above scan takes place one week later and Meryl says they're still expecting strong winds, which is confirmed to have been caused by Izuku.

The air pressure Izuku generated from near Mount Fuji, went all the way across the ocean to the USA.

And even though one week passed, they were still expecting strong winds.

I'm currently aware of two calculations that I believe are usable for this feat.

Izuku's Smash Clears the Storm Over Japan: 226.68 Teratons of TNT (Large Country level) to 453.37 Teratons of TNT (Large Country level+)

Izuku's Smash Clears Weather From Japan to America: 21.18 Petatons of TNT to 42.37 Petatons of TNT (Multi-Continent level)

Both of these calculations are similar. The first calculates the storm over Japan being dispersed.

While the second one calculates the entire area that was affected by Izuku's attack. I believe using the distance from Japan to America is alright.

Since we have no reason to believe the shockwave reached America yet also slowed down enough that it doesn't effect our results.

One Week of Wind: 908.886 Teratons of TNT (Continent level)

I'm aware of my calculation here, but I don't think it compares to the two calculations above, which are far more sensible. Though you're free to make your own opinions. I've been informed it could be possible to add this one together with Therefir's calculation, though I'm not sure how that all works.

This thread is not just about discussing these calculations. But to discuss any alternative calculations, assuming you think they're accurate.

Note: This is a discussion on what calculation will be accepted. Character profiles or scaling is not to be discussed here. No profiles will be changed from this thread regardless of what is accepted. Depending on what is accepted, a CRT will be made in the future to discuss character scaling and everything it entails.

 

[TheRustyOne]

@Damage3245 @Therefir @CloverDragon03 @Dalesean027 @DemonGodMitchAubin

 

[Damage3245]

Izuku's Smash Clears Weather From Japan to America: 21.18 Petatons of TNT to 42.37 Petatons of TNT (Multi-Continent level)

I don't believe that this one would be the most accurate way of calcing it.

The storm is not shown to have reached the United States by the time that Izuku throws his punch that clears it, so Izuku's shockwave doesn't need to have affected a volume of air as large as that in such a short span of time to have produced the result of a week of sunny skies.

One Week of Wind: 908.886 Teratons of TNT (Continent level)

This one I don't think is quite right either. Strong winds still being expected a week after the incident doesn't mean it is solely the energy of Izuku's punch driving those winds as it's not a closed-energy system where he is the only input. There's the whole weather system of the rest of the world and Izuku's punch may have messed up the patterns significantly but that wouldn't mean he's the only contributing factor for why it would be windy - nor does it mean that just because strong winds are expected means that there has been non-stop constant high winds every second of the day across the entire country.

Izuku's Smash Clears the Storm Over Japan: 226.68 Teratons of TNT (Large Country level) to 453.37 Teratons of TNT (Large Country level+)

I think this first calc is the best one for now for the feat but this is just at as first glance and I'll double-check the contents of the calc myself soon just to verify that everything is alright.

 

[Dalesean027]

WATASHI WA KITA!!!
Oh im late... I'll check after work

 

[CloverDragon03]

Meryl says that "the gust that blew that day came in the wake of a great battle." Wouldn't that mean there was a gust of wind that reached from Deku all the way to America? My thought process is that this statement implies America felt a gust of wind from that fight (specifically from Deku's final punch, given the flashback), and Meryl is explaining what caused it

 

[Dalesean027]

Meryl says that "the gust that blew that day came in the wake of a great battle." Wouldn't that mean there was a gust of wind that reached from Deku all the way to America? My thought process is that this statement implies America felt a gust of wind from that fight (specifically from Deku's final punch, given the flashback), and Meryl is explaining what caused it

Yes America did get directly affected by the shockwaves which are still even after a week causing strong winds even in America

 

[CloverDragon03]

Yeah, I'm primarily wondering if the fact that the shockwave reached America could be useful for something

 

[TheRustyOne]

The storm is not shown to have reached the United States by the time that Izuku throws his punch that clears it, so Izuku's shockwave doesn't need to have affected a volume of air as large as that in such a short span of time to have produced the result of a week of sunny skies.

That's not what I'm calculating. You should take a closer look. Izuku produced a shockwave that dispersed the storm and we know that shockwave reached America. So the total volume of air effected should be from Izuku to America. Unless we have reason to believe Izuku's air pressure changed size/shape and slowed down?

The reasoning is the exact same. It's a blast of air being disperse from a center point. In the case of the first calculation it only measures the storm's area. But we know the shockwave reached America so I'm including that area as well. Which increases the results.

The calculator used to get weight can be used for just air as well. I'm not saying he blew away a storm of that size.

Meryl says that "the gust that blew that day came in the wake of a great battle." Wouldn't that mean there was a gust of wind that reached from Deku all the way to America? My thought process is that this statement implies America felt a gust of wind from that fight (specifically from Deku's final punch, given the flashback), and Meryl is explaining what caused it

Yes, the shockwave Izuku produced here was large enough to reach America.

The second calculation in the OP is taking that into account.