Saju vs Bazi
Updated October 7, 2026
Short answer: Korean Saju and Chinese Bazi are the same system — the Four Pillars of Destiny — with the same eight characters. The differences are in habits: how birth time is corrected, what things are called, and which parts of a reading people care about most.
Is Korean Saju the same as Chinese Bazi?
Yes, at the core. Both turn a birth moment into four pillars — year, month, day and hour — each made of a Heavenly Stem and an Earthly Branch. Both start the year at Ipchun / Lichun (立春, around February 4), change months at the solar terms, and count days in the same unbroken 60-day cycle. Give a Korean almanac and a Chinese almanac the same moment in the same place, and they produce the same eight characters.
The names tell the story: 사주 (saju) means “four pillars” and 사주팔자 (saju palja) “four pillars, eight characters”; 八字 (bazi) is simply “eight characters”. The system came to Korea from China centuries ago and grew its own customs there.
What is actually different?
| Korean Saju | Chinese Bazi | |
|---|---|---|
| Name | 사주팔자 saju palja | 八字 bazi, 四柱 sizhu |
| Stem names | Gap, Eul, Byeong, Jeong… | Jia, Yi, Bing, Ding… |
| Your “self” character | 일간 ilgan | 日主 rizhu / 日元 riyuan |
| Ten Gods | 십신·십성 sipsin / sipseong | 十神 shishen |
| Luck pillars | 대운 daeun | 大運 dayun |
| Useful element | 용신 yongsin | 用神 yongshen |
| Symbolic stars | 신살 sinsal — very popular | 神煞 shensha — used, often secondary |
| Compatibility | 궁합 gunghap | 合婚 hehun |
| Birth-time correction | Longitude correction is the norm | Varies: clock time or true solar time |
| Rat-hour boundary | About 23:30 on Korean clocks | 23:00 (clock or solar time) |
Why do Korean readers correct the birth time?
Korea’s clocks run on UTC+9, which is the solar time of longitude 135°E — a line that passes east of the Korean peninsula, through Japan. Seoul sits at about 127°E, so its sun is roughly 32 minutes behind its clocks. Because the pillars follow the sun, Korean almanacs (만세력, manseryeok) shift the birth time by the longitude. That is why Korean hour tables usually show the Rat hour as 23:30–01:30 rather than 23:00–01:00.
There is history behind it, too. Korea has used UTC+9 since 1912 — in South Korea, except from 1954 to 1961, when it switched to UTC+8:30 — the time of 127.5°E, the meridian through the middle of the peninsula. It also used daylight saving in some years, most recently in 1987 and 1988. A Korean-born chart has to get all of this right before any reading starts.
Chinese practice varies more. China uses a single time zone, UTC+8, for the whole country, so in the far west the clock can run more than two hours ahead of the sun. Many Chinese calculators use clock time by default and offer true solar time (真太陽時) as an option; many professional readers insist on it. Our Bazi calculator and Saju calculator both correct for longitude and daylight saving by default (but not for the equation of time, the small seasonal wobble included in strict true solar time), and let you switch the correction off.
Do Korean and Chinese readings emphasize different things?
The building blocks are shared, but popular Korean Saju leans on a few things more heavily:
- Sinsal (신살) — symbolic stars such as 도화살 (dohwasal, the “peach blossom” of charm and attraction) and 역마살 (yeokmasal, the “traveling horse” of movement and travel) are everyday words in Korea, even among people who never get a reading.
- Gunghap (궁합) — comparing two charts before marriage is a long-standing custom, and zodiac-animal pairs like the wonjin (원진) “resentment” pairs are well known. Try our compatibility check.
- The yearly check-up — around the Lunar New Year many Koreans look at their fortune for the year ahead (신년운세), and saju cafés where you can get a reading over coffee are a familiar sight in Seoul.
English-language Bazi, by contrast, mostly reaches readers through teachers in Hong Kong, Singapore and Malaysia, which is why English terms such as “Rob Wealth” and “Seven Killings” are translations of Chinese rather than Korean names. Bazi is also often taught alongside feng shui.
Will I get the same chart from a Saju and a Bazi calculator?
You should — if both calculators handle time the same way. In practice, charts most often differ near the edges: a birth within about an hour of a two-hour boundary (the hour pillar), near 23:00–01:00 (the day pillar), or within minutes of a solar term (the month pillar). The cause is nearly always time handling: daylight saving, longitude, or the Rat-hour rule. Korean and Chinese lunar calendars can also differ by a day now and then, because new moons are dated by Korean and Chinese clocks respectively — but the pillars themselves come from the solar terms, not the lunar date.
Is Saju the same as Bazi?
Yes. Saju is the Korean name and Bazi the Chinese name for the Four Pillars of Destiny. Both use the same stems, branches, solar terms and 60-day cycle, so the same birth moment and place give the same eight characters. The differences are in time correction, terminology and what readers emphasize.
Why do Korean Saju readings use 127.5° or local solar time?
Korean clocks run on UTC+9, the solar time of 135°E, but Korea itself lies around 124–131°E. From 1954 to 1961 South Korea actually used UTC+8:30, the time of 127.5°E. Korean almanacs therefore correct the birth time to local solar time — for Seoul, about 32 minutes earlier than the clock. Many Korean almanacs subtract a flat 30 minutes (127.5°E) for everyone; ours uses your birth city’s exact longitude.
Is Saju accurate?
There is no scientific evidence that birth charts predict personality or events. What a calculator can be is accurate in the technical sense — computing the right eight characters for your birth moment. We test ours against an independent almanac library. The reading itself is best treated as a centuries-old language for reflection, for entertainment.
Which is better, Saju or Bazi?
Neither — they are two dialects of the same tradition. If you have Korean roots or love Korean culture, Saju’s vocabulary and customs like gunghap may feel closer. If you study with English Bazi books and teachers, you will meet the Chinese terms. The chart underneath is the same.
Sources: time-zone history from the IANA tz database (Asia/Seoul, Asia/Shanghai); longitudes from GeoNames; terms from standard Korean and Chinese Four Pillars references. Checked October 7, 2026. For entertainment and self-reflection only.