BaZi Calculator
BaZi reveals the natal pattern through the Four Pillars and its changes through Luck Cycles. AI offers interpretation and an ongoing dialogue.
What is BaZi? Understanding the Four Pillars of Destiny
BaZi (八字), also known as the Four Pillars of Destiny, is an ancient Chinese astrological system that has been used for over 1,000 years to understand personality, predict life events, and guide important decisions.
The Four Pillars Explained
Your BaZi chart consists of four pillars, each representing a different aspect of your life:
Year Pillar
Represents your ancestry, early childhood, and social relationships. It influences how others perceive you.
Month Pillar
Represents your parents, career potential, and the foundation of your character. Often considered the most important pillar.
Day Pillar (Day Master)
Represents your true self, personality core, and relationships with spouse or partners. This is the central pillar of your chart.
Hour Pillar
Represents your children, creativity, legacy, and later years of life.
The Five Elements
BaZi analysis is based on the interaction of five elements: Wood, Fire, Earth, Metal, and Water. Each element has unique characteristics and interacts with others through cycles of generation and control.
Wood represents growth, creativity, and kindness
Fire represents passion, enthusiasm, and transformation
Earth represents stability, reliability, and nurturing
Metal represents precision, determination, and righteousness
Water represents wisdom, flexibility, and communication
How to Read Your BaZi Chart
A BaZi report is built from a handful of interlocking layers. Each one below links to a full guide if you want to go deeper than the summary.
The Four Pillars & your Day Master
The Heavenly Stem of your day pillar is your Day Master — the character that represents you. Everything else in the chart is read relative to it: the season decides whether it is strong or weak, and that verdict drives which elements help or harm you.
Four Pillars of Destiny guideFive Elements balance
Every stem and branch carries elemental weight — including the stems hidden inside each branch, which this engine weighs at full, medium, and residual strength (1.0 / 0.7 / 0.5) rather than simply counting characters. The resulting balance is the basis for finding your favorable elements.
Five Elements guideThe Ten Gods
The Ten Gods translate the relationship between your Day Master and every other character into the classical vocabulary of life domains — wealth, authority, resource, output, and peers. They are how eight abstract characters become statements about career, money, and relationships.
Ten Gods guideSymbolic Stars (Shen Sha)
Shen Sha are pattern-matched markers — nobleman stars, peach blossom, traveling horse and the rest — that add color and specificity to a reading. This engine derives 57 of them using the conventions of the Ming-dynasty compendium San Ming Tong Hui.
Symbolic Stars encyclopediaLuck Pillars (Da Yun)
Your chart is static; your luck pillars move. Each ten-year pillar reweights the whole chart, and the age at which the first one begins is unique to you — this engine computes it to the hour and shows the exact calendar date your cycles turn over.
Luck Pillars guideChart patterns (Ge Ju)
Beyond element counting, classical analysis classifies charts into named structures. This engine recognizes 25 patterns — the eight regular structures plus follow, dominant, and transformation patterns — including the advanced case where a three-branch combination rewrites the elemental balance of the whole chart.
Chart patterns guideAccuracy
Why Our Charts Are Accurate
From time zone resolution to the Lichun year boundary — exactly how we calculate every step, why we do it that way, and how you can verify it.
Five Birth-Time Corrections Behind an Accurate BaZi Chart
Every BaZi chart is built from a single input: the exact moment and place of your birth. Before the first Heavenly Stem is placed, that timestamp has to pass through five corrections — time zone, daylight saving time, true solar time, the zi-hour convention, and the year boundary. Each one can shift your hour pillar, your day pillar, or even your year pillar. A calculator that skips any of them is casting a chart for a moment you were not born at.
Here is exactly what this calculator does at each of the five gates — specific, verifiable rules rather than a vague promise of accuracy.
Gate 1 · Resolving the historical time zone
Your birthplace coordinates are resolved against the full historical time zone dataset, which preserves regional boundaries as they existed before 1970. The commonly used simplified dataset merges zones that happen to agree today — erasing exactly the historical differences that matter for a birth chart. For countries whose legal standard meridian is not a whole-hour offset, such as India (82.5°E) or Myanmar (97.5°E), a dedicated table of 19 countries supplies the correct reference meridian; everywhere else it is derived from the legal UTC offset in force in your birth year.
Gate 2 · Historical daylight saving time
The engine carries historical DST rules for 124 countries and regions — not just today's rules, but the ones in force on your birth date. China observed summer time only from 1986 to 1991, with different start and end dates each year, and all six yearly windows are built in. The United Kingdom ran double summer time during the Second World War, and its 1968–1971 year-round UTC+1 experiment is treated as standard time so the hour is not subtracted twice. For historical periods where generic DST detection provably fails — post-Soviet transitions, Syria and Jordan abolishing DST in 2022, and others — the engine maintains 41 hand-verified standard-time override windows across 22 time zones, each boundary cross-checked against the IANA time zone database (2026b). Ambiguous local times (a clock rolled back, so the same wall time happened twice) and non-existent local times (skipped by a spring-forward) are detected and flagged rather than silently guessed.
Gate 3 · True solar time
Traditional BaZi divides the day by the sun, not by the clock, so the calculator converts your clock time to true solar time in two steps. First, a longitude correction of four minutes per degree between your birthplace and the standard meridian of your time zone. Second, the equation of time — the annual wobble between clock time and sundial time — computed with a six-term trigonometric series rather than the common three-term shortcut. The equation of time alone swings roughly between −14 and +16 minutes across the year; combined with the longitude offset, the total correction routinely exceeds half an hour and can cross a two-hour branch boundary. When the corrected moment lands in a different traditional hour, or even a different day, every affected pillar is recalculated.
Gate 4 · The zi-hour convention (23:00–01:00)
Births between 11 pm and 1 am fall into the zi hour, where two classical conventions disagree: the traditional school advances the day pillar at 11 pm, while the early/late zi school keeps the day pillar until midnight and only changes the hour. This calculator supports both — you choose the convention, and the choice is saved with your chart. Under the late-zi rule, the hour stem is derived from the next day’s day stem using the classical Five Rats formula (五鼠遁), the detail that written sources agree on and casual implementations most often get wrong.
Gate 5 · The year boundary at Lichun, to the second
In Ziping BaZi, the year pillar — and the zodiac animal with it — changes at Lichun, the solar term marking the start of spring, not at Chinese New Year. This calculator switches the year pillar at the astronomically computed instant of Lichun, precise to the second, and applies the same boundary when you enter a lunar-calendar birth date. Anyone born in the window between Lichun and the lunar new year, in either order, gets the correct year pillar — a boundary case that a dedicated regression test locks in place.
An Engine You Can Audit, Not Just Trust
Accuracy claims are cheap; engineering practices are checkable. These are the ones behind every chart cast on this page.
700,000+ charts calculated for 70,000+ users on FateMaster
An algorithm that keeps getting upgraded — currently v30
The chart engine is versioned, currently v30. That number tracks how far the algorithm has climbed: zi-hour conventions, branch destructions, gong combinations, hidden combinations, 25 chart patterns, and historical time-zone rules for 124 countries and regions — the algorithm keeps reaching deeper and wider, and every upgrade is logged in the source code. What you store is your birth data, not one version's output: after an upgrade, your chart picks it up the next time you open it. Nothing to re-enter.
86 automated tests on time handling alone
Time zone and daylight saving logic is guarded by 86 automated test cases, organized by country and rollout batch, from the United States and Europe through Indonesia and the post-Soviet zones. The Lichun year boundary has its own regression test.
57 symbolic stars, verified chart by chart
The symbolic-star (Shen Sha) engine covers 57 verified stars. It is validated against 39 fully annotated reference charts — every pillar of every chart labeled with the expected stars — and currently scores 100% recall and 100% precision on that suite: no missed stars, no false positives. The verification script lives in the codebase and can be re-run at any time.
Astronomical solar terms, classical arithmetic
Solar terms are computed from astronomical formulas with nutation corrections, not read from coarse lookup tables, so the month pillar follows the exact instant of each term. The luck pillar starting age uses the classical three-days-per-year rule and carries the remainder all the way down to the hour, giving you an exact starting date rather than a rounded age.
The Classical Canon Behind the Rules
The rules in this engine are not improvised. Pillar construction, Ten God relationships, symbolic stars, and pattern classification follow the Ziping tradition as documented in the classical canon, and where schools disagree — as with the zi hour or certain star definitions — the convention used is stated openly and, where possible, offered as a choice.
The interaction rules for stems and branches — combinations, clashes, punishments, harms, and the partial and hidden combinations — are documented publicly in our guides with their classical sources, so any practitioner can check the chart against the books.
- Yuanhai Ziping (渊海子平)the Song-dynasty foundation of the Day Master method
- San Ming Tong Hui (三命通会)the Ming encyclopedia; source of our symbolic-star conventions
- Ziping Zhenquan (子平真诠)the Qing classic on chart patterns and useful gods
- Di Tian Sui (滴天髓)the classic on elemental flow and chart dynamics
- Qiong Tong Bao Jian (穷通宝鉴)the seasonal-adjustment reference
When Your Chart Sits on a Boundary, We Tell You
Some charts are genuinely ambiguous: a birth five minutes from an hour boundary, a true-solar correction that crosses into another traditional hour, a birth date inside a daylight saving window, or a late-zi birth where the two conventions produce different charts. In each of these cases the calculator warns you explicitly and shows what changed, instead of presenting one possibility as certainty. A chart you can trust starts with knowing how solid its foundations are.
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Get Your Reading
What the report covers, how to use the calculator, and answers to common questions.
Comprehensive Destiny Analysis
In-depth analysis of various aspects of your destiny chart, providing wisdom and inspiration for your life choices
Personality Insights
Understanding your character traits and innate potential, helping you discover inner strengths and growth directions
Career Direction
Insights into your professional talents and development opportunities, providing directional guidance for your career planning
Wealth Characteristics
Analyzing wealth patterns and financial tendencies, providing thoughtful insights for your financial decisions
Relationship Fortune
Understanding your emotional patterns and romantic characteristics, providing insights for your emotional life
Health Fortune
Analyzing physical constitution and health tendencies, providing reference suggestions for wellness and health maintenance
*This service is based on traditional Chinese metaphysics, for reference and entertainment only. Important decisions should consider multiple factors comprehensively
User Guide
Simple four steps to get your professional BaZi analysis report
Fill in Birth Information
Enter accurate birth date and time
Select Gender
Confirm personal information
Confirm Calendar Type
Choose solar or lunar calendar
Get Analysis Report
View detailed interpretation results
Frequently Asked Questions About BaZi
How accurate is BaZi reading?
BaZi has been refined over centuries and many practitioners find it remarkably insightful. Our AI-powered system combines traditional wisdom with modern analysis to provide detailed and personalized readings. While no system can predict the future with certainty, BaZi offers valuable perspectives on personality traits, potential challenges, and favorable periods.
What is true solar time, and does it change my chart?
True solar time is the time a sundial at your birthplace would show. It differs from clock time for two reasons: your longitude within the time zone (four minutes per degree from the standard meridian) and the equation of time, an annual wobble of roughly −14 to +16 minutes. Together the correction often exceeds half an hour, which is enough to move a birth into a different traditional hour — and near midnight, a different day. This calculator applies both corrections automatically from your birthplace, and warns you when the correction changes a pillar.
I was born during daylight saving time. Do I need to adjust my birth time?
No — enter the clock time exactly as recorded, and the engine handles the rest. It carries historical daylight saving rules for 124 countries and regions, including cases most tools miss: China observed summer time only from 1986 to 1991 with different dates each year, and several countries had wartime or transitional rules that no simple formula captures. When your birth falls in a DST window, the calculator flags it and applies the correction visibly.
I was born between 11 pm and 1 am. Which day does my chart use?
That window is the zi hour, and two classical conventions disagree about it: the traditional school starts the new day at 11 pm, while the early/late zi school keeps the day pillar until midnight. The two conventions can produce different day pillars — effectively different charts. This calculator supports both and lets you choose, saving the choice with your chart; under the late-zi rule the hour stem is correctly derived from the next day’s stem using the classical Five Rats formula.
I was born in late January or early February. Which zodiac year am I?
In BaZi the year pillar — and the zodiac sign with it — changes at Lichun, the start-of-spring solar term that falls around February 3–5, not at Chinese New Year. Someone born on February 1 usually still belongs to the previous year’s pillar even if the lunar new year has already passed. This calculator switches years at the astronomically computed instant of Lichun, so births in that ambiguous window get the correct year pillar and zodiac animal.
Can I enter a lunar calendar birth date?
Yes. The calculator accepts both Gregorian and Chinese lunar dates, including leap months, for births from 1900 to 2100, and converts them using precise astronomical calendar data. The year pillar still follows the Lichun boundary rather than the lunar new year, so a lunar date near the year boundary is resolved correctly. Dates outside the supported range are rejected explicitly instead of producing a silently wrong chart.
What if I don't know my exact birth time?
While knowing your exact birth time provides the most accurate reading (as it determines your Hour Pillar), you can still get valuable insights from the Year, Month, and Day pillars. We recommend using your best estimate, or you can try different times to see which reading resonates most with your life experiences.
How is BaZi different from Western astrology?
While Western astrology focuses on planetary positions at birth, BaZi is based on the Chinese solar calendar and the interaction of Heavenly Stems and Earthly Branches. BaZi emphasizes the balance of five elements and their dynamic interactions throughout your life, offering a unique perspective complementary to other systems.
How often should I check my BaZi reading?
Your core BaZi chart never changes, but the influence of annual and monthly energies does. We recommend reviewing your reading at the start of each year to understand upcoming influences, and checking monthly forecasts for guidance on timing important decisions.
Can BaZi help me make important life decisions?
BaZi can provide insights into favorable timing for career moves, relationships, investments, and other major decisions. By understanding your elemental balance and current luck cycles, you can make more informed choices aligned with your natural strengths — as one perspective among the many a serious decision deserves.
Go Deeper
Every concept used on this page has a full guide. Start with the ones behind your own chart.