Saju vs bazi: same chart, two names

If you've met the four pillars chart under two names and wondered whether they're rival systems: they aren't. Saju (사주, 四柱) is the Korean name; bazi (八字, "eight characters") is the Chinese one. Both point at the same thing — your birth moment written as four pairs of calendar characters — and a chart drawn by a Korean reader and a Chinese reader from the same birth date shows the same eight characters.

The differences are real, but they sit around the chart rather than inside it: the words used for its parts, the customs that grew up around reading it, and what each tradition tends to look at first. This guide lays those out side by side without picking a winner. Sajoo reads the Korean way because that's who we are, not because the Korean way is more correct.

What is identical

• The calendar. Both use the sexagenary cycle — ten heavenly stems and twelve earthly branches — to write the year, month, day, and hour of birth.
• The pillars. Four of them, two characters each: eight characters in all. Korean saju palja (사주팔자) and Chinese bazi (八字) are literally the same count.
• The year boundary. Both turn the year pillar at the start of spring (입춘 · 立春), around February 4 — not on January 1 and not at Lunar New Year.
• The core reading tools. The Day Master (일간 · 日主), the five elements with their feeding and controlling cycles, and the ten relationship types (십성 · 十神) are shared.
• The result. Given the same birth date and hour, a saju chart and a bazi chart are the same chart.

Where the names differ

Most of the vocabulary is the same Chinese characters read in two languages — 입춘 and 立春 are one word, read in Korean and in Chinese — so a term you learned on a bazi site has a direct saju equivalent. Even where the characters differ, as with Korean 일간 (日干, "day stem") and Chinese 日主 ("day master"), they point at the same character in the chart. The one place English readers get tripped up is spelling: bazi literature usually writes the ten stems in pinyin (jia, yi, bing…) and Korean sources in hangul romanization (gap, eul, byeong…). Same ten stems, different letters.

Where the practice differs

Customs. In Korea the chart is woven into a few specific life moments: 궁합 (gunghap), comparing two charts before a marriage; naming a baby so the name's characters supply an element the chart lacks; and 환갑 (hwangap), the sixtieth birthday, celebrated because the birth year's stem-and-branch pair has come back around. Chinese communities have parallel customs of their own — marriage matching, auspicious dates, name selection — organized around the same chart with their own emphasis.

Hour conventions. Both traditions split the day into twelve two-hour blocks. How to handle the clock — standard time versus local solar time, and where exactly the day turns around the 23:00 hour — is debated inside each tradition as much as between them. So two charts can differ in the hour pillar depending on the reader's convention, whichever name the chart goes by.

Schools. Neither name is a single school. Bazi has several interpretive lineages; Korean 명리 (myeongni) has its own readings of the classical texts and modern readers who weigh the chart's strength, its useful element, and the ten relationship types in different proportions. "Saju" and "bazi" name the chart. The reading comes from the reader.

So which should you use?

If your question is about the chart, there is nothing to choose — any correct calculator, Korean or Chinese, gives you the same four pillars. If your question is about the reading, choose the tradition and the language you want to read in. Sajoo's readings are written the Korean way, in plain English, with the Korean terms kept alongside so that a reader coming from bazi can follow every step.

Questions people ask

Is saju the same as bazi?

Yes, as a chart. Saju is the Korean name and bazi the Chinese name for the four pillars of birth — year, month, day, and hour, written in the sexagenary calendar. The calculation is identical; the reading traditions around it differ in vocabulary and custom.

Can I use a bazi calculator to get my saju chart?

Yes. A correct bazi calculator gives the same eight characters a saju calculator does. The ten stems may be spelled in pinyin rather than Korean romanization, and some calculators differ on hour conventions, but the pillars are the same.

Is "Four Pillars of Destiny" saju or bazi?

Both. It is the common English rendering of the system's formal name, 四柱命理 — saju myeongni in Korean, sìzhù mìnglǐ in Chinese.

Did saju come from Korea?

The four pillars system is a shared East Asian tradition with classical roots in Chinese texts, and it has been practiced and developed in Korea for centuries. Saju is the Korean reading of that shared inheritance, not a separate invention — and Sajoo doesn't claim otherwise.