Saju vs BaZi: the same chart, two names

One system, two names

BaZi (八字) means “eight characters”; Saju (사주) means “four pillars.” Both name the identical thing: your birth year, month, day and hour, each written as a heavenly stem and an earthly branch. Same eight characters, same five elements, same sixty-year cycle.

BaZi is the Chinese name for the method; saju is the Korean name and the reading culture built around it. Hand the same birth moment to a Chinese BaZi master and a Korean saju reader, and they write down the same chart.

What Korea kept — and made its own

Korea adopted the classical calculation whole: the same almanac, the same solar-term boundaries, the same stems and branches. What grew differently is the reading culture. Saju wove itself into everyday Korean life — new-year readings, marriage compatibility (gunghap, 궁합), and choosing a baby’s name to balance the chart.

So the difference you feel between a “saju” reading and a “BaZi” reading is usually emphasis and vocabulary, not arithmetic. Korean readings lean into naming and relationships; Chinese readings often foreground classical wealth and career frames. The chart underneath is shared.

Do the two ever give different charts?

Not from the same inputs. The pillars are calendar facts — for a given date, time and place, they’re fixed. When two websites disagree, it’s almost never “saju vs BaZi”; it’s calculation quality (did they honor the solar-term boundary and your birthplace’s true solar time?) or interpretation style.

This is the part worth getting right. Guessing at the boundary between two months, or skipping the birthplace correction on the hour pillar, quietly changes a pillar — and everything read from it.

Which word should you search for?

Drawn to the Korean thread — K-culture, gunghap, a Korean name from your chart? Search saju. Reading in the Chinese metaphysics tradition? Search BaZi. Either way you’re looking at the same Four Pillars, so it’s fair to lead with “Korean Four Pillars (BaZi)” and treat saju as the Korean flavor of it.