How to use it
What this tool is useful for
Convert a Gregorian birth date and local clock time into a Four Pillars chart while keeping the calendar method and boundary limits clear.
BaZi
Four Pillars BaZi Calculator
Enter a Gregorian birth date and local time to see the four pillars, hidden stems, Ten Gods, Na Yin, branch relations, and element counts, with clear calendar and time-boundary limits.
Output preview
See the report shape before you start
The output below shows what this tool can document. Input details and examples are explained in the next section.
What you will see
2 input details explained below
- 1
Input and assumptions
Shows Gregorian input, local clock time, solar-term month boundary, 23:00 day boundary, and unapplied time corrections.
- 2
Pillar detail
Displays pillars, stem and branch elements, Yin/Yang, hidden stems, Ten Gods, and Na Yin.
- 3
Relation lookup
Records matched Liu He, Liu Chong, Liu Hai, Liu Po, San He, San Hui, and Zi Xing table conditions.
What you need before you start
Before starting, confirm that dates, times, and other details are accurate, and note which items are required or optional. Do not replace missing required information with a guess.
Birth date
date required
Calculates the year, month, and day pillars and lunar conversion.
Example: 1990-06-15
What to enter: Must be a valid Gregorian date no later than the current moment.
If you leave it out: No pillar can be calculated.
Birth time (local clock)
time required
Calculates the day-boundary case and hour pillar from local clock time.
Example: 12:00
What to enter: Must be precise to the minute; boundary cases need comparison.
If you leave it out: A reviewable day and hour record cannot be produced.
How it works
This tool uses the details you enter on the page to produce a result. It is free to use, and your information is not sent to a third-party AI service.
Complete example
Worked example: a complete Four Pillars chart
This fictional input uses an exact local clock time. The result applies a solar-term month boundary and 23:00 day boundary, but no time-zone, daylight-saving, longitude, or true-solar-time correction.
Example details
- Gregorian birth date
- 1990-06-15
- Local clock time
- 12:30
- Exact-minute input, mapped to 午时.
Example result
- Year · month · day · hour
- 庚午 · 壬午 · 辛亥 · 甲午
- Lunar conversion
- 1990, month 5, day 23 · 午时
- Day Master record
- 辛 · Yin Metal
- A structural label, not a personality or ability finding.
- Eight-character surface counts
- Wood 1 · Fire 3 · Earth 0 · Metal 2 · Water 2
- These counts exclude hidden-stem weights, season, roots, combinations, and school-specific strength rules.
How to check it again
Save the input and stated boundary method, then compare every pillar character and element count. If the real birth record may cross 23:00, an hour boundary, or a solar term, calculate both candidate inputs and mark every change.
What this example cannot prove
This record does not establish strength, favourable elements, personality, health, income, career, relationship quality, or future events.
Use cases
Recommended
Learn the chart structure
Inspect the four pillars, stems, branches, hidden stems, and five-element distribution.
Recommended
Compare boundary policies
Record the 23:00 day change, solar-term month boundary, and time assumptions, then compare which pillars change across a boundary.
Infer personality or future outcomes
A chart structure cannot prove personality, ability, health, wealth, career, relationships, or future events.
What the result is based on
Solar-term calendar conversion
Uses solar-term boundaries and changes the day pillar at 23:00 local clock time.
Four-pillar structure
Records the four stems and four branches for year, month, day, and hour.
Ten God and hidden-stem lookup
Displays traditional labels from stem relationships without deriving a real-world outcome.
Surface element counts
Counts eight visible characters only and does not treat quantity as strength, favourability, or a remedy.
What you will see
Input and assumptions
Shows Gregorian input, local clock time, solar-term month boundary, 23:00 day boundary, and unapplied time corrections.
Pillar detail
Displays pillars, stem and branch elements, Yin/Yang, hidden stems, Ten Gods, and Na Yin.
Relation lookup
Records matched Liu He, Liu Chong, Liu Hai, Liu Po, San He, San Hui, and Zi Xing table conditions.
Element counts and limits
Shows surface element counts and explains why they cannot establish strength, personality, or outcomes.
What you can do next
Save the chart details
Keep date, time, place, time zone, daylight-saving status, and calendar method with the pillars.
Compare boundary results
Calculate both sides of a possible boundary and mark every part that changes.
Separate real-world evidence
Keep traditional labels apart from contradictory evidence and qualified domain advice.
Time zone and true solar time
The tool does not collect birthplace or time zone and does not correct historical daylight saving, longitude, or true solar time.
Boundary uncertainty
Times near 23:00, an hour boundary, or a solar term require candidate-chart comparison.
No outcome inference
Day Master, Ten Gods, branch relations, and element counts are not used to infer personality, health, income, career, marriage, or future events.
This is a Four Pillars chart record
Four Pillars calculation converts a Gregorian birth date and local clock time into year, month, day, and hour stem-branch pairs. This page displays the birth details, conversion, and calendar rules so you can check the result again.
The chart shows which traditional details follow from this page's stated calendar method. It does not prove that a Day Master, Ten God, branch relation, or element count measures personality, ability, health, wealth, career, relationships, or future events.
What the chart includes
The main steps remain visible so you can locate a date, time, or calendar-method difference instead of accepting an unexplained summary.
- Gregorian input, lunar conversion, year-branch zodiac label, and assigned double-hour branch.
- The four pillars with each visible stem and branch element, yin-yang class, and Na Yin lookup.
- Surface Ten Gods relative to the Day Stem, hidden stems, and hidden-stem Ten Gods.
- Matched Six Harmony, Six Clash, Six Harm, Six Break, Three Harmony, Three Meeting, and self-punishment lookup conditions.
- Visible counts for the four stems and four branches, without converting count into strength or a remedy.
Calendar and clock policy
Input is a Gregorian date and local clock time to the minute. Year and month pillars use solar-term boundaries, the day pillar changes at 23:00 local clock time, and the hour pillar follows twelve double-hour ranges.
The page does not collect birthplace or time zone, so it cannot correct historical daylight saving, longitude, or true solar time. Near 23:00, an odd-hour branch boundary, or a solar term, preserve candidate charts on both sides and mark every change.
How to read the visible element count
The page maps only the eight visible stem and branch characters to Wood, Fire, Earth, Metal, and Water. It does not add hidden-stem weights, season, roots, combinations, transformation, climate adjustment, or any school's strength method. The largest count is not automatically strongest, and zero does not prove a real-life deficiency.
Do not use the count to prescribe a colour, direction, occupation, food, accessory, or household object, and do not infer health, personality, income, or partner suitability. A report that adds strength, useful-element, or remedy claims must disclose the additional method and disagreement.
Verification and stop conditions
Keep the Gregorian date, local clock time, birthplace, historical time zone, daylight-saving status, and day-boundary rule with the result. When details are uncertain, compare only the parts that remain stable across the plausible range; never choose the chart that sounds more flattering.
Stop using the chart whenever a medical, investment, employment, legal, relationship, or safety decision depends on one chart detail. Use facts, records, consent, and qualified advice from the relevant domain instead. Getting the same chart again does not prove that a traditional interpretation is true.
What is the difference between this and the BaZi marriage tool?
It shows one chart's calendar conversion and traditional details. The marriage tool compares two charts with clearly explained traditional-rule reference scores. Neither page proves a relationship outcome, and birth details are not sent to a third-party AI service or placed behind a paid report.
Why does my chart look different from another website?
This page uses Gregorian input, solar-term month boundaries, and a 23:00 day change. It does not correct time zone, historical daylight saving, longitude, or true solar time. Another tool can differ when it uses another day-change school or applies location corrections, especially near a solar-term or double-hour boundary.
Does the largest or zero element count identify strength or a favourable element?
No. The count covers only the four visible stems and four visible branches. It omits hidden-stem weighting, season, roots, combinations, transformations, and school rules. The page therefore does not label strength, calculate a favourable element, or recommend colours, directions, industries, food, or objects.
Which calendar assumptions must a Four Pillars tool disclose?
It should state whether the entered date is Gregorian or lunar, the time zone, daylight-saving treatment, solar-term month boundary, day-change convention, and true-solar-time policy. It should preserve the converted date, four pillars, hidden stems, and any uncertainty around the hour. If a birth time or location is missing, the report must reduce time-dependent detail instead of filling a confident default. These assumptions are part of the result and should remain visible whenever the chart is saved or shared.
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