<p>In the last episode of My Hero Academia (Season 3, episode 8) , they gave an explanation for this (spoilers)</p>

<blockquote class="spoiler">
  <p> According to the doctor who cured Midoriya from his battle with muscular, when Midoriya says "100%" he would be using 80% of his power that's the upper limit a person can use in normal situations, and when Midoriya says 1,000,000%, he was using 100% of his power which is a power only a person can use when he is in an extreme situation, something that makes any person (including Midoriya) being bad injured after because no person is capable of using 100% of his power without hurting itself, that's why a person can only use 80% of his power in normal situations for not hurting his own body <a href="https://i.sstatic.net/0HWtT.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/0HWtT.jpg" alt="enter image description here"></a><a href="https://i.sstatic.net/rS4ed.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/rS4ed.jpg" alt="enter image description here"></a></p>
</blockquote>

CC BY-SA 4.0
2018-05-28T03:14:09.043Z
2018-05-28T03:14:09.043Z
Pablo
<p>It was confirmed by the Author that it wasn't actually 1000,000%. Deku said that to pump himself up.</p>

<p>This is explained in <a href="https://comicbook.com/anime/2018/04/29/my-hero-academia-delaware-detroit-smash-izuku-anime-creator-comments/" rel="nofollow noreferrer">this article</a>, as well as the image below: </p>

<p><a href="https://i.sstatic.net/VOyPj.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/VOyPj.png" alt="&quot;The Supplementary Info - 1,000,000 percent?&quot;"></a></p>

CC BY-SA 4.0
2018-05-26T20:08:53.350Z
To be exact and clarify, the author confirmed this in volume 9, in a page explaining that the "1,000,000%" Smash was indeed just a battle cry fueled by adrenaline.
totoofze47
CC BY-SA 4.0
2018-05-21T21:45:26.367Z
2018-10-02T23:56:36.913Z
2018-10-02T23:56:36.913Z
LoneStar
<p>In his fight against Bloodthirsty Muscular, Deku hits a 1000,000% One for All punch when we haven’t seen even All Might use that much power. How can this be possible?</p>

CC BY-SA 4.0
2018-05-23T08:42:01.543Z
Duplicate of https://anime.stackexchange.com/questions/46793/does-one-for-all-give-unlimited-power/46804#46804
Syed Rafay
CC BY-SA 4.0
2018-05-26T11:39:56.163Z
it just felt like that to him so he said it. otherwise if a 100% could destroy his hand a1000,000% would make him explode
Henjin
<my-hero-academia>
How could Deku hit 1000,000% One for All punch when he had no memory of it?
# How could Deku hit 1000,000% One for All punch when he had no memory of it?
Posted by: username_0 on 2018-05-21
In his fight against Bloodthirsty Muscular, Deku hits a 1000,000% One for All punch when we haven’t seen even All Might use that much power. How can this be possible?
**Tags:** my-hero-academia
> **Comments:**
> **username_1**: Duplicate of https://anime.stackexchange.com/questions/46793/does-one-for-all-give-unlimited-power/46804#46804  
> **username_2**: it just felt like that to him so he said it. otherwise if a 100% could destroy his hand a1000,000% would make him explode  
---
## 2 answers
### Answer by username_4 on 2018-05-21. Score: 7 | Accepted answer
It was confirmed by the Author that it wasn't actually 1000,000%. Deku said that to pump himself up.

This is explained in [this article](https://comicbook.com/anime/2018/04/29/my-hero-academia-delaware-detroit-smash-izuku-anime-creator-comments/), as well as the image below:

[![](https://i.sstatic.net/VOyPj.png)](https://i.sstatic.net/VOyPj.png)
> **Comments:**
> **username_5** (2018-05-26): To be exact and clarify, the author confirmed this in volume 9, in a page explaining that the "1,000,000%" Smash was indeed just a battle cry fueled by adrenaline.  
---
### Answer by username_3 on 2018-05-28. Score: 1
In the last episode of My Hero Academia (Season 3, episode 8) , they gave an explanation for this (spoilers)

> According to the doctor who cured Midoriya from his battle with muscular, when Midoriya says "100%" he would be using 80% of his power that's the upper limit a person can use in normal situations, and when Midoriya says 1,000,000%, he was using 100% of his power which is a power only a person can use when he is in an extreme situation, something that makes any person (including Midoriya) being bad injured after because no person is capable of using 100% of his power without hurting itself, that's why a person can only use 80% of his power in normal situations for not hurting his own body [![enter image description here](https://i.sstatic.net/0HWtT.jpg)](https://i.sstatic.net/0HWtT.jpg)[![enter image description here](https://i.sstatic.net/rS4ed.jpg)](https://i.sstatic.net/rS4ed.jpg)
---
