Blood-type dating charts combine this word with the familiar A, B, O and AB personality stereotypes. They are popular-culture fortune-telling—not a medical compatibility test.
- 1 Blood type compatibility in Japan: the quick answer
- 2 The Japanese word for compatibility: 相性（aishō）
- 3 Japanese blood type compatibility chart
- 4 A + A compatibility
- 5 A + B compatibility
- 6 A + O compatibility
- 7 A + AB compatibility
- 8 B + B compatibility
- 9 B + O compatibility
- 10 B + AB compatibility
- 11 O + O compatibility
- 12 O + AB compatibility
- 13 AB + AB compatibility
- 14 How blood type enters Japanese dating talk
- 15 Natural Japanese dating examples
- 16 Does blood type predict relationship success?
- 17 When compatibility talk becomes harmful
- 18 FAQ about blood type compatibility in Japan
- 19 Blood type dating in Japan: summary
Blood type compatibility in Japan: the quick answer
Japanese blood type compatibility applies personality stereotypes to relationships. A type described as careful may be paired with one described as confident; two independent types may be called exciting but unstable.
There is no official Japanese compatibility chart. Different magazines, quiz sites and fortune-tellers rank the same pairing differently, and some charts change the result according to gender.
Medical compatibility concerns antigens, antibodies and safe transfusion. Dating compatibility is a cultural story built from personality stereotypes.
The Japanese word for compatibility: 相性（aishō）
- 相性がいい — to be compatible; to have good chemistry
- 相性が悪い — to be incompatible; not work well together
- 恋愛の相性 — romantic compatibility
- 血液型の相性 — blood-type compatibility
- 相性占い — compatibility fortune-telling
私たちは相性がいいと思う。
Watashitachi wa aishō ga ii to omou.
“I think we have good chemistry.”
Japanese blood type compatibility chart
The chart below covers the ten unique pairings. It summarizes common narrative patterns, not a scientifically tested ranking.
| Pairing | Common strengths in the stereotype | Common friction in the stereotype |
|---|---|---|
| A + A | Dependable, polite, organized | Overthinking, suppressed feelings, too much caution |
| A + B | Different strengths; structure meets creativity | A may find B selfish; B may find A restrictive |
| A + O | Details and big-picture confidence complement each other | A may feel O is careless; O may feel A worries too much |
| A + AB | Thoughtful, calm, intellectually compatible | Both may avoid direct emotional communication |
| B + B | Spontaneous, energetic, accepting of independence | Unstable routines and competing personal priorities |
| B + O | Active, social, adventurous | Both may push their own pace or compete for control |
| B + AB | Original, curious, respectful of personal space | Mood and intentions may be difficult to read |
| O + O | Warm, direct, enthusiastic | Pride, rivalry and strong opinions |
| O + AB | Confidence meets analytical calm | O may want openness while AB wants distance |
| AB + AB | Independent, low-pressure, mutually understanding | Emotional distance and lack of initiative |
A + A compatibility
In the stereotype, two A types understand each other’s need for planning, manners and reliability. The relationship may feel safe, but both partners may hesitate to raise a problem.
A型同士だから、気を使いすぎるかもね。
“Because you’re both type A, you might be too considerate.”
A + B compatibility
This is the classic “opposites” story. A represents order and social awareness; B represents freedom and personal enthusiasm. A chart may call the pair incompatible—or say that their differences create balance.
A型とB型って正反対じゃない？
“Aren’t type A and type B complete opposites?”
A + O compatibility
This pairing is often portrayed positively in popular charts. A manages details and protects stability, while O provides confidence and emotional momentum. The same traits can produce conflict if O appears careless or A appears controlling.
A + AB compatibility
A and AB are both frequently described as thoughtful and restrained. They may share a calm atmosphere, but indirect communication can leave important feelings unstated.
B + B compatibility
Two B types are imagined as giving each other freedom and enjoying new interests. The stereotype warns that neither person may want to handle routine obligations.
B + O compatibility
B and O are both commonly described as energetic. O may enjoy B’s originality, while B may appreciate O’s confidence. Friction appears when both expect the other person to follow their pace.
B + AB compatibility
This pairing is often written as intellectually interesting and independent. Both may appreciate individuality, although their moods and priorities can seem unpredictable to each other.
O + O compatibility
Two O types are portrayed as warm and decisive. The relationship may move quickly, but competition or pride can become part of the story.
O + AB compatibility
Popular explanations frame this as attraction between opposites: expressive confidence meets cool mystery. The relationship depends on communication because the two stereotypes want different levels of emotional openness.
AB + AB compatibility
Two AB types may respect personal space and understand each other’s complexity. The common warning is that both wait for the other person to initiate emotional conversation.
How blood type enters Japanese dating talk
Blood type may appear as:
- a first-date icebreaker;
- a profile field;
- a playful reason to explain attraction or conflict;
- a magazine or app quiz;
- a joke between partners who already know each other well.
It is rarely safe to assume that knowing someone’s type tells you how seriously they take the system. Ask about their view rather than guessing:
血液型占い、信じる？
Ketsueki-gata uranai, shinjiru?
“Do you believe in blood-type fortune-telling?”
Natural Japanese dating examples
A: 何型？
“What type are you?”B: B型。相性悪い？
“Type B. Are we incompatible?”A: そんなの気にしないよ。
“I don’t care about that kind of thing.”
Does blood type predict relationship success?
There is no established scientific basis. Compatibility charts depend on the assumption that ABO type predicts personality, but large-scale research has found that blood type accounts for almost none of the variation in personality responses.
Real compatibility depends on communication, values, behavior, circumstances and many other factors that a four-category chart cannot measure.
When compatibility talk becomes harmful
Playful fortune-telling becomes a problem when blood type is used to exclude or demean someone. Refusing a person, employee or teammate solely because of a blood-type stereotype may be described as ブラハラ (burahara), or blood-type harassment.
FAQ about blood type compatibility in Japan
Which blood types are most compatible in Japan?
There is no authoritative answer. Popular charts often describe A and O or B and O as complementary, but rankings vary by source and are not scientifically validated.
Do Japanese people choose dates by blood type?
Some people use blood type as a playful preference or conversation topic, but it is not a universal or reliable rule for Japanese dating.
What does aishō mean?
相性 (aishō) means compatibility, chemistry or how well two people or things work together.
Is blood type dating compatibility scientifically proven?
No. Research has not established that ABO blood type predicts personality, so it cannot provide a scientific basis for romantic compatibility.
How do I say “We are compatible” in Japanese?
Say 私たちは相性がいい (Watashitachi wa aishō ga ii), meaning “We are compatible” or “We have good chemistry.”
Compatibility Type Check
“Compatibility” means two very different things depending on context. Make sure you are looking at the right one.
cultural personality stereotypes, no official chart
antigens and antibodies, an unrelated field entirely
shared strengths, but also shared weaknesses can double up
opposite traits balance out, but can clash over pace or control
※ There is no single official chart. Different magazines and quiz sites rank the same pairing differently.
Blood type dating in Japan: summary
- 相性 (aishō) means compatibility or chemistry.
- Japanese blood-type charts build relationship stories from A, B, O and AB stereotypes.
- There is no official ranking, and different sources contradict one another.
- The charts may be used for entertainment, profiles or small talk.
- They are not supported as a scientific predictor of personality or relationship success.
- Takeji Furukawa, “A Study of Temperament by Means of Human Blood Groups” (1927), J-STAGE
- Tatsuya Sato and Yoshiyuki Watanabe, history of Furukawa’s theory, J-STAGE
- Kengo Nawata, “No relationship between blood type and personality” (2014), J-STAGE
- Japanese Red Cross Society, red-cell blood groups and the ABO system
- Broadcasting Ethics & Program Improvement Organization, request concerning blood-type television programs (2004)
