The Short Answer
Saju (사주) and BaZi (八字) are essentially the same system — the one usually called the Four Pillars of Destiny in English. If you have read anything about one, you already understand most of the other.
The reason people ask "are they the same?" is simply that the method travels under different names in different countries. "Saju" is the Korean name and "BaZi" is the Chinese name, but they point at an identical chart, built from the same components in the same way.
So the honest, quotable answer is: yes, Saju and BaZi are two names for the same method. The differences that remain are small, and they concern language, custom, and interpretive emphasis — not the underlying structure.
Why Two Names?
The two names describe the same object from slightly different angles.
- Saju (四柱) is Korean and literally means "four pillars."
- BaZi (八字) is Chinese and literally means "eight characters."
Both are correct, because the chart is made of exactly four pillars, and each pillar contains exactly two characters — so four pillars equals eight characters. One name counts the columns; the other counts the pieces inside them.
Every chart has four pillars: Year, Month, Day, and Hour, each derived from a person's date and time of birth. Each pillar is a pair of one Heavenly Stem on top and one Earthly Branch below. Four pairs make eight characters. That is all "Saju" and "BaZi" are describing.
What They Share (Almost Everything)
Under the two names sits one method. Both use:
- The same ten Heavenly Stems and twelve Earthly Branches.
- The same 60-year cycle (the sexagenary calendar) to assign stems and branches to years, months, days, and hours.
- The same Five Elements (Wood, Fire, Earth, Metal, Water) and their generating and controlling relationships.
- The same central idea of the Day Master — the Heavenly Stem of the Day pillar, which represents "you" and anchors the whole reading.
Because the calculation is identical, a birth chart cast as Saju and the same birth cast as BaZi produce the same eight characters. There is no separate "Korean chart" and "Chinese chart" — it is one chart with two labels.
One method, several regional names
The system originated in China and spread across East Asia, picking up local names along the way:
- In Korea it is called Saju, and the broader study is Myeongri (명리학), "the study of destiny principles."
- In China it is BaZi, sometimes grouped under Ziping (子平) methods.
- In Japan it is Shichusuimei (四柱推命), literally "inferring destiny from the four pillars."
Different names, same 60-cycle calendar and the same eight characters underneath.
The Real (Small) Differences
There are genuine differences, but they are matters of language and habit rather than structure. It helps to name them precisely.
Terminology and pronunciation
The core concepts are written with the same Chinese characters but read in each language's own pronunciation. The Day Master is a good example: Korean sources call it 일간 (ilgan), while Chinese sources say 日主 (rìzhǔ) or 日元 (rìyuán). These are labels for the same thing — the Day pillar's stem. So a Korean and a Chinese practitioner can be discussing the identical component while using words that sound nothing alike.
Calendar and time convention
This is the one place where two people can occasionally arrive at slightly different charts. Because the Hour pillar depends on the exact time of birth, some practitioners adjust for true solar time and for the longitude of the birthplace rather than using clock time as-is.
For example, Korea sits around 127°E, but its standard time is set to the 135°E meridian. Some Korean practitioners subtract roughly half an hour to reflect Korea's true solar time; others do not. When a birth falls near the boundary between two two-hour Earthly Branch slots, this adjustment can nudge the Hour pillar into the neighbouring branch. It is a convention difference in how the clock is read, not a difference in the method itself — and it only matters for births close to an hour boundary.
Interpretive lineage and emphasis
Korean and Chinese traditions read the same chart while leaning on overlapping classical texts. Importantly, the major classics are shared Chinese sources used in both traditions, including:
- Ziping Zhenquan (子平真詮) — in Korean, Japyeong Jinjeon (자평진전)
- Qiong Tong Bao Jian (窮通寶鑑) — Gungtong Bogam (궁통보감)
- Di Tian Sui (滴天髓) — Jeokcheonsu (적천수)
So the difference is not different source books — it is which schools and nuances each tradition emphasizes, and the lineage of teachers passing the material down. Korean Myeongri, for instance, places notable weight on climatic balance (johu) and on the structure-based (gyeokguk) approach, but these too descend from the shared classics above.
Bottom Line
Learn Saju and you have effectively learned BaZi; learn BaZi and you have effectively learned Saju. The eight characters are the same, the Five Elements are the same, and the Day Master means the same thing in both. What changes is the name on the door, the pronunciation of the terms, and a few habits of calendar and emphasis.
The best way to see this for yourself is to build your own chart and read the eight characters directly.
- Cast your own eight characters with the free Saju calculator.
- Curious how the animal signs line up across cultures? See Korean Zodiac vs Chinese Zodiac.
- Comparing traditions more broadly? Read Saju vs Western Astrology.
- New to the whole subject? Start with What is Saju?.
---
Saju (Four Pillars) is a tool for reflection, not deterministic prediction. Your chart describes tendencies and timing, not a fixed fate — the choices remain yours.