BaZi and Zodiac
BaZi Chart Calculator
Builds an approximate BaZi reference chart using sexagenary stem-branch cycles, a solar-year boundary approximation, and timezone-aware local birth inputs.
Use the tool
Fill in only the planning details needed for this calculation. Do not enter private medical, financial, legal, or identification data.
Methodology
How this tool works
The calculator uses the proleptic Gregorian calendar, Intl timezone formatting, Chinese calendar support where available, a February 4 solar-year approximation for year pillars, fixed solar-month boundaries for month pillars, a known sexagenary-day anchor, and two-hour earthly-branch periods.
Cultural variation notes
- Some practitioners calculate the year pillar from Li Chun rather than Lunar New Year.
- Birth certificates, hospital records, daylight saving time, and local longitude can change a professional chart.
- Different schools weigh hidden stems, ten gods, luck pillars, and useful elements differently.
FAQ
Frequently asked questions
Is this a professional BaZi reading?
No. It is a reference calculator for pillars and elements. A practitioner may refine the chart with exact solar terms, birthplace longitude, and school-specific rules.
Why does timezone matter?
The day and two-hour branch can change when a birth time is interpreted in the wrong local timezone.
Can I use an unknown birth time?
You can test a best estimate, but the hour pillar will be uncertain. Mark the result as approximate when sharing it.