<p>Maybe Jiraiya transformed into Tsunade using a transformation technique and found the size using traditional measures by measuring himself(!).</p>

<p>He may have used <a href="http://naruto.wikia.com/wiki/Sexy_Technique" rel="noreferrer">Sexy Technique</a>.</p>

<p><img src="https://i.sstatic.net/39UEr.png" alt=""></p>

CC BY-SA 3.0
2016-02-24T14:17:31.620Z
According to wiki [Jiraya](http://naruto.wikia.com/wiki/Jiraya) never used Sexy technique (see in Jutsu column).
Light Yagami
CC BY-SA 3.0
2016-02-25T17:56:46.113Z
Just because he is never show to and never admits to using it does not mean it was used by him. He definitly prefers the real thing though, so he would not want to transform without a good reason (like finding the numbers). the WIki can only use stuff the manga and other major sources provide. for Kakashi, "he is reputed to have copied over a thousand jutsu"  Straight from the wiki, Though it only lists about 40 Jutsu, the ones he actually used in the series.
Ryan
CC BY-SA 3.0
2016-04-01T19:25:49.373Z
This doesn't make any sense. Just because he transformed into her does not mean he would have aimed exactly her breast size. He would still have had to measure them.
Akira Mahisaseru
CC BY-SA 3.0
2015-02-05T08:32:11.230Z
2015-02-11T00:42:56.233Z
2015-02-11T00:42:56.233Z
krishna - Itachi's fan
<p>Jiraiya was a very powerful ninja, and particularly proficient in stealth missions. He was almost the sole source of all information on Akatsuki, and was able to enter Amegakure and defeat several of Pain's bodies.</p>

<p>Jiraiya feared Tsunade after she beat him particularly badly once, but if the mission was important enough he showed himself to be ready to risk death. </p>

<p>I believe that with careful planning and execution, Jiraiya could have and would have done this.</p>

CC BY-SA 3.0
2015-02-01T21:18:38.100Z
2015-02-01T21:18:38.100Z
Qiri
<p>During the time he was training Naruto, Jiraiya was seen fooling around with girls. It could be from the experience with girls that he had gathered for decades, that he was able to measure a girl's breast size based on looking only.</p>

CC BY-SA 3.0
2015-02-02T07:46:34.307Z
2015-05-31T03:38:42.963Z
2015-05-31T03:38:42.963Z
絢瀬絵里
<p>I believe the real reason why Jiraiya knows Tsunade's measurements probably has to do with him being somewhat of a lady's man in his own words. Which can be confirmed as there's an occasion when he's surrounded by women, thus meaning that he is such an experienced lover that he is capable of guessing a woman's measurement by looking at them. Plus he spent a lot of time spying on Tsunade in hot springs!</p>

CC BY-SA 4.0
2022-12-23T06:09:39.830Z
2022-12-23T06:09:39.830Z
Dylan Rumfield
<p>My best guest is he use his <a href="http://naruto.wikia.com/wiki/Cloak_of_Invisibility_Technique" rel="nofollow">Cloak of Invisibility Technique</a> a.k.a Cloaking Technique. (Synonymous to Naruto's kage bunshin). I just can't remember on what episode of manga the 3rd Hokage mentioned about Jiraiya using it (I think during a flashback of their training).</p>

CC BY-SA 3.0
2015-02-02T06:54:29.460Z
2015-02-02T06:54:29.460Z
Mark
<p>Jiraiya stated that Tsunade's <em>oppai</em> size was <strong>106cm</strong>.</p>

<p>From <a href="http://naruto.wikia.com/wiki/Tsunade" rel="noreferrer">Tsunade article</a>:</p>

<blockquote>
  <p>Despite being known as flat-chested in her childhood, she now has a rather large bust; <strong>106 centimetres</strong> in circumference, according to Jiraiya.</p>
</blockquote>

<p>From <a href="http://naruto.wikia.com/wiki/Jiraiya" rel="noreferrer">Jiraiya article</a>: </p>

<blockquote>
  <p>when caught spying on Tsunade in his younger years, she proceeded to break both of his arms, six of his ribs, and ruptured a number of organs as punishment.</p>
</blockquote>

<p>Considering the amount of fear and respect Jiraiya then developed towards her, <strong>how did he know the measurement of the adult Tsunade?</strong></p>

<p>Source: <a href="https://www.youtube.com/watch?v=ny7Fni193Jk" rel="noreferrer">https://www.youtube.com/watch?v=ny7Fni193Jk</a></p>

<p>(I'm really sorry about the quality of the video)</p>

<p>Below is the image from the corresponding scene in the manga (chapter 406, page 9):</p>

<p><img src="https://i.sstatic.net/qVJge.png" alt=""></p>

CC BY-SA 3.0
2015-02-01T08:06:05.080Z
Maybe he just got more experience estimating bust size through clothing?
Clockwork-Muse
CC BY-SA 3.0
2015-02-02T03:22:49.543Z
[Sexy no Jutsu](http://naruto.wikia.com/wiki/Sexy_Technique) sounds reasonable to get the actual size.
3.1415926535897932384626433832
CC BY-SA 3.0
2015-02-10T13:16:50.003Z
It's possible he calculated it based on where she was, the position of the sun, the shade they created.
Denslat
CC BY-SA 3.0
2016-02-24T09:21:37.040Z
they are team mates a few decades . . .
Tanya von Degurechaff
CC BY-SA 3.0
2016-02-26T14:18:45.407Z
@NamikazeSheena that maybe so. But I dont see how that explains the method Jiraiya used to find how the "stuff" is
Ero Sɘnnin
<naruto>
How did Jiraiya find out Tsunade's breast size?
# How did Jiraiya find out Tsunade's breast size?
Posted by: username_0 on 2015-01-31
Jiraiya stated that Tsunade's *oppai* size was **106cm**.

From [Tsunade article](http://naruto.wikia.com/wiki/Tsunade):

> Despite being known as flat-chested in her childhood, she now has a rather large bust; **106 centimetres** in circumference, according to Jiraiya.

From [Jiraiya article](http://naruto.wikia.com/wiki/Jiraiya):

> when caught spying on Tsunade in his younger years, she proceeded to break both of his arms, six of his ribs, and ruptured a number of organs as punishment.

Considering the amount of fear and respect Jiraiya then developed towards her, **how did he know the measurement of the adult Tsunade?**

Source: <https://www.youtube.com/watch?v=ny7Fni193Jk>

(I'm really sorry about the quality of the video)

Below is the image from the corresponding scene in the manga (chapter 406, page 9):

![](https://i.sstatic.net/qVJge.png)
**Tags:** naruto
> **Comments:**
> **username_1**: Maybe he just got more experience estimating bust size through clothing?  
> **username_2**: [Sexy no Jutsu](http://naruto.wikia.com/wiki/Sexy_Technique) sounds reasonable to get the actual size.  
> **username_3**: It's possible he calculated it based on where she was, the position of the sun, the shade they created.  
> **username_4**: they are team mates a few decades . . .  
> **username_0**: @NamikazeSheena that maybe so. But I dont see how that explains the method Jiraiya used to find how the "stuff" is  
---
## 5 answers
### Answer by username_5 on 2015-02-05. Score: 11
Maybe Jiraiya transformed into Tsunade using a transformation technique and found the size using traditional measures by measuring himself(!).

He may have used [Sexy Technique](http://naruto.wikia.com/wiki/Sexy_Technique).

![](https://i.sstatic.net/39UEr.png)
> **Comments:**
> **username_6** (2016-02-24): According to wiki [Jiraya](http://naruto.wikia.com/wiki/Jiraya) never used Sexy technique (see in Jutsu column).  
> **username_7** (2016-02-25): Just because he is never show to and never admits to using it does not mean it was used by him. He definitly prefers the real thing though, so he would not want to transform without a good reason (like finding the numbers). the WIki can only use stuff the manga and other major sources provide. for Kakashi, "he is reputed to have copied over a thousand jutsu"  Straight from the wiki, Though it only lists about 40 Jutsu, the ones he actually used in the series.  
> **username_8** (2016-04-01): This doesn't make any sense. Just because he transformed into her does not mean he would have aimed exactly her breast size. He would still have had to measure them.  
---
### Answer by username_9 on 2015-02-01. Score: 7
Jiraiya was a very powerful ninja, and particularly proficient in stealth missions. He was almost the sole source of all information on Akatsuki, and was able to enter Amegakure and defeat several of Pain's bodies.

Jiraiya feared Tsunade after she beat him particularly badly once, but if the mission was important enough he showed himself to be ready to risk death.

I believe that with careful planning and execution, Jiraiya could have and would have done this.
---
### Answer by username_10 on 2015-02-02. Score: 7
During the time he was training Naruto, Jiraiya was seen fooling around with girls. It could be from the experience with girls that he had gathered for decades, that he was able to measure a girl's breast size based on looking only.
---
### Answer by username_11 on 2022-12-23. Score: 3
I believe the real reason why Jiraiya knows Tsunade's measurements probably has to do with him being somewhat of a lady's man in his own words. Which can be confirmed as there's an occasion when he's surrounded by women, thus meaning that he is such an experienced lover that he is capable of guessing a woman's measurement by looking at them. Plus he spent a lot of time spying on Tsunade in hot springs!
---
### Answer by username_12 on 2015-02-02. Score: 2
My best guest is he use his [Cloak of Invisibility Technique](http://naruto.wikia.com/wiki/Cloak_of_Invisibility_Technique) a.k.a Cloaking Technique. (Synonymous to Naruto's kage bunshin). I just can't remember on what episode of manga the 3rd Hokage mentioned about Jiraiya using it (I think during a flashback of their training).
---
