Enter your birth date, recorded time, and birthplace to calculate a Four Pillars chart. Review the Day Master, Ten Gods, Hidden Stems, Five Elements, Luck Pillars, and the calculation conventions used.
Four Pillars · Innate blueprint & five-element balance
OpenFate calculates the Four Pillars before any optional AI interpretation. The free result shows the pillars, Day Master, Ten Gods, Hidden Stems, Five Element structure and Luck Pillars, together with the civil-time, True Solar Time, solar-term and day-boundary settings used for this chart.
Bazi, or Four Pillars, represents the birth year, month, day, and hour as four Heavenly Stem and Earthly Branch pairs. Those eight characters form the calculated chart; interpretation is a separate step.
A trustworthy calculator should make its inputs and conventions inspectable. This matters most for births near an hour, day, solar-term, or historical time-zone boundary, where a small change in the adjusted time can change a pillar.
Enter the calendar type, birth date, recorded local time, and birthplace. This chart calculator requires a birth time; if it is unknown, use the dedicated Birth-Time Calibration tool instead of inventing one. Birthplace provides longitude and time-zone context, while the date determines which historical civil-time and solar-term rules apply. If the source record is lunar, identify a leap month rather than converting it by guesswork.
Civil clock time, local solar time, and the Bazi day boundary are separate choices. OpenFate records whether True Solar Time is applied, which day-boundary mode is selected, and that the Month Pillar follows solar terms rather than the numbered lunar month.
In a fixed calculation example, 2024-06-15 at 23:45, longitude 112°E, and UTC+8 becomes 23:12 after True Solar Time correction. With a 23:00 day rollover, the Day Pillar is 辛亥 (Xin-Hai); with a 00:00 rollover, it is 庚戌 (Geng-Xu). The birth record is unchanged—the declared boundary rule explains the different result.
Begin with the four pillars and the Day Master, then examine seasonal context, Ten Gods, Hidden Stems, Five Element structure, and branch interactions. Review Luck Pillars only after confirming the natal chart and calculation basis. A simple element count is not, by itself, a complete strength or useful-element judgment.
When another calculator disagrees, change one setting at a time: calendar type, leap-month status, birth place, time-zone or DST treatment, True Solar Time, and day-boundary mode. If the adjusted time crosses an hour, day, or solar-term boundary, a different pillar may be the expected result of a different convention.
The chart is reproducible under the stated inputs and rules. Personality, relationship, career, wealth, and future-event statements are traditional interpretations rather than guaranteed outcomes. Use them for reflection, not as medical, legal, financial, or safety advice.
OpenFate displays calculation details and publishes its deterministic calendar engine under an MIT license. The methodology page records the tested version, covered boundaries and replay instructions; annotated examples show what a setting changes.
That evidence supports reproducibility under declared inputs and conventions. It does not scientifically validate Bazi interpretation, and the test count should not be treated as an accuracy ranking against another calculator without a shared independent benchmark.
Add a second person’s birth date, time and place to compare both Four Pillars charts by Day Master, Five Elements and the spouse palace. Bazi compatibility calculator
A BaZi chart starts with the recorded birth time and place. OpenFate checks five boundaries that can change the Hour, Day, Month or Year Pillar before any optional AI reading begins.
Restore the civil-time rules that applied at the birthplace on the recorded date.
Detect skipped or repeated local times and keep ambiguity visible instead of silently guessing.
Apply birthplace longitude and the equation of time when this convention is selected.
Record whether the Day Pillar changes at 23:00 or 00:00 and recalculate affected pillars.
Use Li Chun for the Year Pillar and solar terms for the Month Pillar, including exact boundary times.
Inspect the calculation settings, annotated examples and published evidence before choosing a reading.
If a birth time falls inside a daylight-saving gap or fold, near Zi hour or a solar-term transition, or crosses a pillar boundary after True Solar Time correction, OpenFate keeps the uncertainty visible and recalculates the affected pillars. It does not force one answer simply to make the chart look complete.
Follow the editorial standards, shared validation process and the exact method used for this system.
See how OpenFate connects the Four Pillars, patterns and luck cycles into a readable BaZi report you can ask questions about.
The complete BaZi reading is organized into 10 distinct themes, moving from the chart structure to practical choices and the next ten annual readings instead of merely listing Ten Gods, elements or Shen Sha.
Luck cycles, annual readings and details that depend on an exact birth time appear only when the input and calculation evidence support them. Missing information is disclosed rather than guessed.
Start with the free chart. Review the reading scope and example before deciding whether a deeper interpretation is useful to you.
Free charts and paid readings use the same chart calculations. Payment provides a complete interpretation; follow-up questions are charged according to your plan. Traditional readings support self-reflection and do not guarantee future events.
Answers about calculation rules, uncertain birth times, and differences between Bazi calculators.
A regular pattern identifies the month-command framework; formation asks whether its required relationships are present; disruption concerns damage to its essential function. In chart versions supporting the three checks, OpenFate shows localized explanations, limits detected conflicts to specific routes, and retains unconfirmed results when evidence is insufficient. These are not achievement levels or a measure of rarity or life success. Read the definitions, examples, and source notes
It shows the calculated Four Pillars, Day Master, Ten Gods, Hidden Stems, Five Element structure, branch interactions, and Luck Pillars supported by the supplied birth data. If the birth time is unknown, use the Birth-Time Calibration tool rather than entering an estimate and treating the resulting Hour Pillar as exact.
They may use different calendar inputs, historical time-zone or DST data, birth coordinates, True Solar Time settings, solar-term boundaries, or 23:00 versus 00:00 day rollover. Compare the inputs and conventions before deciding that either chart is wrong.
True Solar Time is one declared calculation convention. It adjusts civil time using birthplace longitude and the equation of time, which can change a pillar near a boundary. Some schools and tools intentionally use civil time instead, so OpenFate keeps the selected convention visible.
This chart calculator requires a birth time. If it is unknown, do not enter an invented noon or midnight; use the Birth-Time Calibration tool to compare candidate hours and preserve the uncertainty. A possible birth after 23:00 can affect the Day Pillar; a solar-term transition can affect the Month Pillar and, around Li Chun, the Year Pillar.
Yes. Select the calendar printed in the original record and identify a lunar leap month when applicable. The calculator normalizes that date before deriving the pillars, while the Month Pillar follows solar-term boundaries rather than the numbered lunar month.
No. The chart engine calculates the pillars and structured chart facts first. Any optional AI reading receives those results for explanation; it does not replace the deterministic calculation.
Inspect the calculation receipt, align the input and conventions, then use the public methodology for versions, validation scope and replay instructions.
The methodology documents historical time handling, Shen Sha coverage, month frameworks and formation paths. It separates public replay cases from internal test summaries and discloses limitations; neither is proof of predictive accuracy.
Start with the concept that appears in your own chart, then move from foundations to patterns and timing.
OpenFate uses classical texts as documented references, then states the modern time data and school-specific conventions used by the engine. A citation does not erase disagreements between editions or schools.
