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The Japanese horoscope originally combines two systems: the zodiac sign at birth, inherited from Western astrology, and the blood type, considered in Japan as a personality indicator since the 1920s. This crossing, very widespread in contemporary Japanese popular culture, produces forty-eight combinations (12 signs × 4 types A, B, AB, O). Our tool determines your Japanese profile from your date of birth and your blood type, in the lineage of the ketsueki-gata.
The modern Japanese horoscope integrates the ketsueki-gata (血液型), a theory that ties the four blood types of the ABO system to personality traits. The idea was promoted as early as 1927 by the psychologist Takeji Furukawa in his article Study of Temperament through Blood Type, then popularized on a large scale by the journalist Masahiko Nomi starting in 1971. Combined with the Western zodiac sign, imported to Japan in the Meiji era, ketsueki-gata produces forty-eight portraits. Very present in Japanese magazines, mangas, and TV shows, it remains, however, rejected by contemporary science.
To calculate your Japanese horoscope, enter your date of birth, which sets your Western zodiac sign, and your blood type (A, B, AB, or O). No time or place of birth is needed: neither the general solar zodiac nor the ketsueki-gata take them into account. If you do not know your blood type, the result will be limited to the zodiac sign. Combining the two dimensions gives a profile typical of contemporary Japanese popular culture, mixing Western heritage and a national reading of temperament.
In Japan, ketsueki-gata often serves as a social ice-breaker, comparable to the zodiac sign in the West. Type A is tied to rigor and a sense of duty, B to creativity and independence, O to confidence and extroversion, AB to duality and rationality. These stereotypes rest on no solid biological basis and can even lead to discrimination denounced in Japan under the term burahara (blood-type harassment). To be read with perspective.
No. No serious scientific study has shown a reliable link between the ABO system and personality traits. The meta-analyses published since the 2000s, especially Tsuyoshi Sasaki's in 2014, conclude there is no significant correlation. Ketsueki-gata therefore belongs to the cultural sphere, not the scientific one.
It originates in the Japanese intellectual context of the 1920s, marked by a fascination for racial classification then in vogue across Europe. Picked up after the war by Masahiko Nomi, it became part of Japanese popular culture to the point of being cited on résumés, in dating, and in fiction. It also spread to South Korea and Taiwan.
Yes. Japan long used onmyodo, a divination inherited from Chinese cosmology, integrating the twelve-animal zodiac, the five elements, and the sexagenary cycles. This tradition, codified as early as the Heian period (794-1185), remains alive in some Shinto rites, alongside the more recently imported Western astrology.
Burahara (blood-type harassment) refers in Japan to discrimination based on blood type: refusal to hire, romantic breakups, or public mockery. Employers have been denounced for refusing type B or AB candidates. The phenomenon is fought by associations and has helped put ketsueki-gata into perspective in contemporary Japanese society.