Recomputable
The year, month, day and hour stem-branch labels can be calculated again from the same date, clock time and place, using the calendar, civil-time and solar-time rules stated on this site.
Free tool · Gregorian date · Browser-only calculation
Free BaZi
Calculator
Create a Chinese Four Pillars chart from your birth date, time, and place, then learn Day Master, Five Elements, Ten Gods, and Luck Pillars.
Make my chart ↘Fire 火
Water 水
Earth 土
四柱your year
in balance
in balance
The chart desk
Start with the
moment you arrived.
Four pillars translate your birth date and time into a pattern of stems, branches, and elements. We calculate it in your browser. Your details stay here.
◎Private by design
No account. No stored birth data.
No account. No stored birth data.
Check before calculating
Three steps, with uncertainty kept visible
- Use the Gregorian date and local clock time from the birth record. Unknown time uses a clearly labelled noon placeholder.
- Choose the country, region and city at birth. A regional reference is an estimate, not hospital-level coordinates.
- Choose a reading year. After generating, open the full reading and check its time-adjustment section and four pillar pairs before interpreting them.
The tool automatically applies a solar-time estimate using the historical civil offset, reference longitude and equation of time. There is no solar-time toggle. Near a solar term, midnight or a two-hour boundary, compare calculation conventions carefully.
Read the calculation method · What if birth time is unknown?
Your annual reading
The year opens
where you are.
No personal result generated: the public example and checking prompts below are not your personal reading.
FOUR PILLARS / SAMPLEIllustration · not a personal chart
YEAR辛巳Stem + branch
MONTH壬辰Solar-term month
DAY辛亥Day Master: Xin
HOUR甲午Adjusted hour
Example input: 18 April 2001, 12:18, Los Angeles. See the verification steps
What these labels mean
- The year pillar is the stem-branch pair for the birth year under this site's stated calendar rule.
- The month pillar follows a solar-term month, not the number of the Gregorian month.
- The day pillar is the stem-branch pair for the birth day under this site's midnight day boundary.
- The hour pillar names the corrected traditional two-hour period, and a clock time near a boundary can change it.
- The Day Master is the day pillar's stem and the reference for other symbols, not a personality conclusion.
- Heavenly stems are the ten calendar symbols from Jia to Gui, and each pillar begins with one.
- Earthly branches are the twelve calendar symbols from Zi to Hai, and the animal name is only a memory aid.
Folk entertainment, not verifiable
Personality notes, annual advice and fortune language are folk-cultural material for reflection and entertainment. They are not verifiable predictions, and they are not medical, financial, legal, or relationship advice.
Check all four pillars
The public example uses 18 April 2001, 12:18, Los Angeles; it is not calculated from your birth details.
Keep the birth record
Use the Gregorian date, birthplace local clock time and location; then check the report’s time adjustment.
Separate the claims
Stem-branch labels are recomputable from the stated rules; personality and year advice are folk entertainment and not verifiable.
Read with a question
Check the day stem and hidden stems, then study source passages, edition notes and worked exercises—not just an animal label.
02 / BASIC CONCEPTS
Learn the symbols,
then the relationships.
Each pillar has a stem and a branch. The day stem is the Day Master. Understand those definitions before comparing elements, hidden stems, Ten Gods or time periods.
Open the basic concepts ↘03 / Reading Room
Reading Room
Six selected books
Read twenty Yuanhai Ziping articles, twenty-five Sanming Tonghui articles and nineteen Ziping Zhenquan articles and seventeen Di Tian Sui articles, with complete text, original figures and differentiated sources. Thirteen Qiong Tong Bao Jian readings in three collections are also available. Fifteen I Ching readings in three collections bring the total to one hundred and nine.
Enter the Reading Room ↗How this works and privacy
Your reading applies consistent traditional rules for the Gregorian calendar, solar terms, stems and branches, ten-year cycles, five-element relationships, common auxiliary stars, and the I Ching. A selected city uses its reference point; “Other city” uses a regional reference point. A more precise birthplace can affect the hour pillar near a traditional two-hour boundary. Mainland China city names follow the Ministry of Civil Affairs' 2023 administrative-division codes, while coordinates and international city data come from GeoNames. Your birth details stay in this browser while the reading is generated. This is folk-cultural content for entertainment and personal reflection.