The 30-second version: Saju and Bazi are two names for the same birth chart — the Four Pillars (year, month, day, hour) built from the Heavenly Stems and Earthly Branches. The raw math is essentially identical. What differs is the interpretive school: Bazi (八字, "eight characters") is the Chinese lineage; Saju (사주, "four pillars") is the Korean lineage, which grew from the same classical roots but leans harder on the Day Master and the ten gods. Same chart, different reading tradition.
They start from the same chart
Both systems take your birth date, time, and place and convert them into four "pillars." Each pillar has a Heavenly Stem (천간 / 天干) on top and an Earthly Branch (지지 / 地支) below. Four pillars × two characters = eight characters — which is exactly what "Bazi" (八字) means. "Saju" (사주, 四柱) just means "four pillars."
So at the level of the chart itself, Saju and Bazi are the same object with two different names. Both also use the same calendar engine: a sexagenary cycle keyed to the 24 solar terms (jieqi in Chinese, jeolgi in Korean). That's why a Chinese Bazi calculator and a Korean Saju calculator give you the same pillars.
Where they actually diverge
| Dimension | Bazi (中国 八字) | Saju (한국 사주) |
|---|---|---|
| Name & meaning | 八字 — "eight characters" | 사주 (四柱) — "four pillars" |
| Core chart | Four Pillars (identical) | Four Pillars (identical) |
| Calendar | Solar-term sexagenary (same) | Solar-term sexagenary (same) |
| Primary lens | Useful god (用神) and luck cycles | Day Master (일간) and ten gods (십성) |
| Terminology | Classical Chinese terms | Korean Hangul + Hanja terms |
| Signature use | Luck timing, life strategy | Compatibility (궁합), name-giving (작명) |
Notice that the first three rows are the same. The real differences live in emphasis, terminology, and application — not in the chart.
The Day Master emphasis
Korean Saju treats the Day Master — the Heavenly Stem of your birth day — as the anchor of the entire reading. Your personality, strengths, and relationships are read primarily in relation to it. Bazi uses the Day Master too, but classical Chinese practice often gives equal or greater weight to finding the useful god (the element that balances the chart) and to luck-cycle timing.
The ten gods
Both traditions use the "ten gods" (십성 / 十神) — the relationships between the Day Master and the other stems. Korean Saju tends to foreground these as a personality-and-life-flow framework, which is why a Saju reading often feels more like a character portrait than a timing forecast.
Plain-language takeaway: If someone says "Saju is just Korean Bazi," they're half right. The chart is the same; the school of interpretation is different — like two doctors trained in different countries reading the same X-ray.
So which one should you get?
Choose a Saju reading if you want:
- A character portrait built around your Day Master
- Compatibility (gunghap) for a partner, co-founder, or friend
- A plain-language, beginner-friendly first look at your chart
Choose a Bazi reading if you want:
- The classical useful-god analysis
- Detailed luck-cycle timing (大運) as the centerpiece
- To follow the Chinese metaphysics lineage specifically
If you've never seen your Four Pillars before, start with a free Saju reading — you'll get your full chart and a plain-language interpretation in a few minutes, and everything you learn (your pillars, your Day Master, your elements) transfers directly to any Bazi reading later, because it's the same chart.
Common misconceptions
- "Saju and Bazi give different charts." They don't. Same birth data → same pillars. Any difference is interpretation, not calculation.
- "One is more accurate than the other." Neither is "more accurate" at the chart level — the math is shared. Accuracy of a reading depends on the skill (or the engine) doing the interpreting.
- "You need to be Korean or Chinese for it to work." The Four Pillars are calendar-based, not nationality-based. If you know your birth date, time, and location, both systems apply to you.
FAQ
What is the difference between Saju and Bazi? Both read the same Four Pillars built from the Heavenly Stems and Earthly Branches. The difference is tradition and emphasis: Bazi is the Chinese lineage; Saju is the Korean lineage that leans on the Day Master and ten gods. Same chart, different interpretive school.
Is Saju just the Korean word for Bazi? Partly. "Saju" means "four pillars" and "Bazi" means "eight characters" — two names for the same chart. But the Korean tradition (Myeongri-hak) developed distinct interpretive conventions, so Saju is a related but separate school, not just a translation.
Do Saju and Bazi use the same calendar? Yes — both use the solar-term (24 jeolgi / jieqi) sexagenary calendar, so the raw pillar calculation is essentially identical.
What is the Day Master in Saju? It's the Heavenly Stem of your birth day, representing your core self. There are ten Day Masters (five elements in Yin and Yang form). Korean Saju uses it as the anchor of the whole reading.
Want to see your own Four Pillars? You can get a free Korean Saju reading (English supported, no signup) at Cheonmyeongdang — it shows your full chart and Day Master in a few minutes. The full write-up of this comparison lives here.
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