Discover your Four Pillars of Destiny (BaZi / 八字) — the traditional Chinese astrology chart built from your exact birth date and time. Our free BaZi calculator reveals your Year, Month, Day, and Hour pillars, your Day Master personality core, hidden stems, and dominant five elements (Wu Xing).
Sample Four Pillars for May 15, 1990 at 2:30 PM — 庚午 辛巳 庚辰 癸未 (Yang Metal Day Master).
Year
庚
Geng
午
Wu
Horse
Hidden Stems
丁 己
Month
辛
Xin
巳
Si
Snake
Hidden Stems
丙 庚 戊
Day
庚
Geng
辰
Chen
Dragon
Hidden Stems
戊 乙 癸
Hour
癸
Gui
未
Wei
Goat
Hidden Stems
己 丁 乙
庚 (Geng)
Your Day Master is Yang Metal — the core of your BaZi personality and element identity.
Dominant element(s): Metal
Missing or weakest element(s): Wood
BaZi (八字), meaning "Eight Characters," is the Four Pillars of Destiny system in Chinese astrology. Your chart has four pillars — Year, Month, Day, and Hour — each composed of a Heavenly Stem (天干) and an Earthly Branch (地支). Together they form eight characters that describe your innate nature, timing, and elemental balance at the moment of birth.
The Day Master (日主) is the Heavenly Stem of your Day pillar — the most important single character in BaZi. It represents your core self, personality tendencies, and primary element. All other stems and branches in the chart are interpreted relative to the Day Master, much like the sun in a solar system.
Wood, Fire, Earth, Metal, and Water (五行) interact through generating and controlling cycles. Counting how often each element appears across your visible pillars reveals your elemental balance — which elements dominate, which are absent, and where you may seek harmony in life decisions.
Unlike the Year pillar (which changes at Lunar New Year) or the Day pillar (which changes at midnight), the Month pillar in BaZi follows the 24 solar terms (节气). Each month begins at a major solar term such as 立春 (Start of Spring), ensuring the month stem-branch aligns with seasonal energy rather than the civil calendar.