Oppai – Japanese Boobs

What is the real meaning of oppai? Do you know the different ways of referring to Japanese women's breasts? What are the measurements of Japanese breasts and bras? Do Japanese women really have small breasts? Why do anime characters have big boobs? This and other questions will be answered in this Japanese breast guide!

Remembering that this is a complete and didactic guide, a somewhat delicate subject but of importance for everyone, not just for otakus perverted and curious. This article is useful for Brazilians who need to buy clothes in Japan and people who are curious. The table of contents below will help you navigate this long article:

Ever wondered why Japanese women don't shave their pubic hair? Click below to also read our article: Why Japanese women don't usually shave.

The Meaning of Oppai

Anime fans or those who delve into Japanese culture quickly know the word oppi [おっぱい] which means breasts or breasts in Japanese language. What few know is that it is a slang or informal word.

The expression oppi [おっぱい] literally refers to the breast and breasts, while mune [胸] is used to refer to the breasts, sometimes figuratively. Already oppi It mainly refers to the physical part of round and voluminous breasts.

The word oppi can be used both to refer to the breast, breasts or breasts in the plural or singular. This word can be used by both women and men referring to women's breasts.

Despite being an informal word, it is not strange to hear newspapers use the expression oppai to refer to breastfeeding or related issues. Women also often talk to each other using this expression.

We don't know if there are specific rules that say that this word is exclusive to women's breasts, but the word itself recalls the onomatopoeia in boing boing, referring to female breasts. And if we explore the origin we will understand even more why I said that.

Oppai - Japanese breasts

Word Origin for oppai

It is not known for sure how the expression oppai came to be in the Japanese language. Some believe it came from onomatopoeia daddad (ぱいぱい) that children use to refer to their mother's breasts. So we must remember that oppai can sound a little childish, although it is not necessarily a word used by children.

There are other theories that the word arose from ooumai [おおうまい] or from idaddy [いっぱい] which means full, but both seem to be a bit exaggerated. There are records of the word being used in the Edo period, and it is listed as a children's word in the dictionary. It was Meiji.

remember the Oppai shirt used by Saitama from One Punch Man? How about buying one below?

Ways to Say Boobs in Japanese

What other words do the Japanese use to refer to breasts, nipples or breasts in Japanese? Let's see now some vocabulary to improve your studies of nihongo. We also have an article about butts in japanese.

What does Mune mean?

mune [胸] – This word is used to refer to the breasts as a whole, both physically and symbolically, used to refer to the entire thoracic part such as lungs and stomach. The word is usually used mune in songs to talk about heartache and stuff like that.

Menu is like a second word for heart, as the original word for kokoro heart it is too comprehensive, because it can refer to both the mind and the spirit. Therefore mune is a term often used, probably more than oppi.

Other Ways to Say Breasts in Japanese

  • ぱいぱい – daddy (child);
  • ブレスト – burusuto (breast);
  • 母乳 – bonyuu (mother's milk);
  • ボイン – Boin;
  • カップ – kappu (cup);

Other synonyms are:

  • Chibusa [乳房] – breasts, breast, udder;
  • Kyoubu [胸部] – breasts, breasts;
  • Munaita [胸板] – breasts, breasts;
  • Chichi [乳] – Milk, breasts;
  • Muneniku [胸肉] – Breast meat (usually chicken breast);

Vocabulary Related to Boobs in Japanese

Below we have some useful words for women who want to measure sizes or buy accessories related to breasts like bras and others.

  • Bra - ブラジャー (burajya);
  • Chest - 胸 (mune);
  • Breasts – おっぱい (oppai) similar to slang;
  • Cup, Cup – カップ (kappu);
  • Tits, breasts – ぱいぱい (daddy) another kind of childish slang;
  • Bust – バスト (basuto) from English bust;
  • Cleavage - 谷間 – tanima (also means valley, ravine, abyss);

Pettanko, Paizuri, Bakunyuu, Kyonyuuu

There are other Japanese words for breasts. There is even a word for the crisis of having small breasts or large breasts. We have written some articles that will help you understand these factors, we recommend reading them below:

Oppai - Japanese breasts

Japan bra sizes and measurements

Breast size is calculated from A to K, with A being the smallest size. Some countries have small differences in measurement, as in the USA there is AA size, however, the system is the same. It is worth mentioning that this measurement is proportional to the size of the body.

The first thing we can do to determine the size of the breasts is to measure the entire bust with the breasts, then subtract from the bust size measuring below the breasts, the remaining value is the cup size (CUP). (top bust – under bust = cup).

Responsive Table: Scroll the table to the side with your finger >>
SizeCup / CupUnder Busttop bustBrazilian Size
THE 10.2cm 63~6777-8738
B 12.0cm 68~7282-9240
Ç 15.0cm 73~7787-9742
D 17.5cm 78~8292-10244
AND 20.0cm 83~8797-10746
F 22.5cm 88~92102-11248
G 25.0cm 93-97109-11150
H 27.5cm 98-102114-11652

It is worth remembering that the measures of the cup or glass in Japan are different from Brazil. Brazilians usually measure from the bust to the back, thus giving a high value above 78, whereas the Japanese do is divide the 2 measurements mentioned to arrive at an exact size of the breasts.

The image below shows how the busts are measured, and an image showing the size of the Japanese women's busts, however, with the letters

Oppai - Japanese breasts

The bigger the breast size, the bigger the cup. However, knowing this is not enough to buy a bra size. The table below can help you choose the appropriate size for your bust:

Responsive Table: Scroll the table to the side with your finger >>
Under Busttop bustbra size
63~6777~79A65
63~6779~81B65
63~6781~83C65
63~6783~85D65
63~6785~87E65
68~7282~84A70
68~7284~86B70
68~7286~88C70
68~7288~90D70
68~7290~92E70
73~7787~89A75
73~7789~91B75
73~7791~93C75
73~7793~95D75
73~7795~97E75
78~8292~94A80
78~8294~96B80
78~8296~98C80
78~8298~100D80
78~82100~102E80
83~8797~99A85
83~8799~101B85
83~87101~103C85
83~87103~105D85
83~87105~107E85
88~92102~104A90
88~92104~106B90
88~92106~108C90
88~92108~110D90
88~92110~112E90

Average breast size of Japanese women

Have you ever wondered what the average breast size of Japanese women is? Are they smaller than the Brazilian average? Where do you have smaller breasts? Below I will leave a small list with statistics:

Average breast size in Japan:

  • Japanese 5.3% represent size A or smaller;
  • 20% of the Japanese represent size B;
  • 26.3% of the Japanese represent size C;
  • 24.1% of the Japanese represent size D;
  • 16.2% of the Japanese represent size E;
  • 6% from Japanese represent size F or larger;

Average breast size in Brazil:

  • 30% of the Brazilian population is of size A and B;
  • 33% is size C;
  • 19% size D;
  • 16% are E,F and G;

Where are most of these Japanese women concentrated? Below we will leave a list where most of these Japanese are found according to size. Let's see the average size of each province.

  • Size E - Kyoto and Gifu;
  • Size D - Miyagi, Fukushima, Niigata, Yamanashi, Fukui, Nara, Osaka, Okayama, Hiroshima;
  • Size C - Ibaraki, Tokyo, Toyama, Ishikawa, Aichi, Shiga, Mie, Wakayama, Tottori, Shimane, Kagawa, Ehime, Tokushima, Fukouka, Miyazaki, Kagoshima and Okinawa;
  • Size B - Hokkaido, Aomori, Iwate, Akita, Yamagata, Tochigi, Gunma, Chiba, Kanagawa, Nagano, Shizuoka, Hyogo, Yamaguchi, Kochi, Oita, Saga, Nagasaki, Kumamoto;
  • Size A - Saitama;

How did we arrive at these results? – This research is carried out according to the amount of sales of bras, lingerie and other feminine products.

Oppai - Japanese breasts

Do Japanese women really have small breasts?

We've just seen about the average breast size of Japanese women, did you come to any conclusions? Do Japanese women really have small breasts? In fact, Japanese women's breasts are not as small as people think.

In the surveys we saw that only 5% from the Japanese are small size [A]. The big problem is that this measure is proportional to the size of the body, Japanese women are thin and small by nature, which makes their breasts smaller.

Some research reveals that in the last 20 years, there has been an astonishing breast enlargement compared to 1980 where more than 50% of Japanese women were size A.

Another survey carried out with 400,000 women shows that neither Brazil was among the 15 countries with the largest breasts, nor Japan among the 15 countries with the smallest breasts. In fact, Brazil has an average of 30% of Brazilian women with size A and B.

It may even seem that the Japanese are beating Brazil in this average disclosed here. However, this average is proportional to the size of the body, we take the average of the cup by subtracting the top bust from the bottom bust.

Therefore, even though 30% of the Brazilian population is classified with small breasts, due to their body size, breasts can reach up to 20cm. Not to mention that surveys like this are never 100% exact, as it is not possible to do surveys like this with the entire population.

Oppai - Japanese breasts

Why do animes have big boobs?

I believe that the reason why Japanese women have big breasts in anime is kind of obvious, to attract the male audience. But if the standard of Japanese beauty is thin women, why do anime have busty? Or why the Japanese in anime have big eyes and colored hair?

These are unanswered questions, anime clichés. When anime shows titties, panties and attractive positions, it's called fanservice. The objective of a mangaka when creating his work is to attract all types of people, for this reason you can find sizes for all tastes.

The fact that Japanese women have too big breasts can be successful with men in Japan, but in real life prejudice from other Japanese women can happen. We've already seen this portrayed in some anime.

Oppai - Japanese breasts
A giant anime action figure with giant breasts

Oppai Meaning in Korean – Breasts in Korean

Some search Google for oppi in Korean, but they're probably confusing it with treatment honorific and oppa slang. Usually used by women to refer to an older man.

Koreans recognize Japanese slang oppi which can be written [단어]. If you want to refer to breasts in Korean we can use [유방] [가슴] [댕이] [방댕이] [궁디], but unfortunately I am no expert in the Korean language to explain each of these words. A tip is to throw them on Google Image to see how Koreans interpret the meaning.

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