BAZI KNOWLEDGE BASE
How BaZi compatibility works: two charts, examples and scores
BaZi compatibility compares two people’s birth charts through their Day Masters, Day Branches, elemental functions and changing time layers. It is a traditional way of describing similarities, contacts and differences between charts. Reading it well means understanding what was compared, why the terms were chosen and which conditions remain unresolved.
What are the main comparison layers?
Calculate each set of Four Pillars before comparing. A zodiac animal represents one Year Branch; a Day Master is one stem. Both have uses, but neither substitutes for the whole chart. An unknown hour can leave known Year, Month and Day information usable while Hour-Pillar claims remain unresolved.
| Layer | What is compared |
|---|---|
| Day Masters | Phase, polarity and Ten-God roles in both directions |
| Day Pillars and palaces | Stems and branches separately, with the exact contacts named |
| Useful functions | Functions within each natal chart, rather than pooled element counts |
| Cycles and years | Contacts to each chart during the same stated interval |
| Nayin and Shen Sha | Additional classifications or lookups with their own rules |
Why can Jia-Zi and Ji-Chou produce several combination labels?
These two valid Day Pillars illustrate a method; they are not two complete charts. Jia Wood and Ji Earth form a stem combination. Ji is Direct Wealth (a traditional role associated with managing resources and ongoing responsibilities) from Jia’s viewpoint; Jia is Direct Officer (a traditional role associated with rules, responsibility and expectations) from Ji’s. Zi and Chou form a branch combination, so the stem and branch contacts can be stated separately.
“Spouse palaces combine” and “Zi–Chou Day Branches combine” describe the same branch pair. They are not two discoveries. The Jia–Ji combination and directional Wealth (the role family controlled by the birth-day element, often interpreted through resources and practical demands)/Officer (the role family that controls the birth-day element, often interpreted through rules and demands) labels also refer to the same stem pair. Listing the actual contacts is clearer than calling this several confirmations of a perfect match.
We still lack both seasonal contexts, roots and the other pillars. These fragments do not establish transformation, favorable function or a relationship outcome. The Day-Pillar (the two-symbol column for the birth day) guide develops the hidden stems (the additional element symbols traditionally assigned inside each lower chart symbol) and conditions.
Can your chart alone describe a future partner?
Spouse stars and the spouse palace show how the tradition assigns a role and position to partnership within your own chart. They are not another person’s birth data. Wealth, Officer and contact labels cannot supply a partner’s age, occupation, appearance or private thoughts.
With one chart, you can understand the report’s vocabulary and discuss your own expectations. A two-chart comparison requires a second chart actually supplied for that purpose. An imagined ideal partner does not provide the missing data.
Does an 80-point score mean an 80% chance of happiness?
No. A tool might add points for combinations, subtract points for clashes and rescale its chosen weights to 100. That number describes its algorithm; it has not thereby measured love or marriage. An 80 from another tool may use a different scale.
Imagine a formula awarding 20 points for Zi–Chou and another 20 for combining spouse palaces. It has scored one branch pair twice. Giving full Hour-Pillar points despite an unknown hour also makes the number more definite than the inputs. Look for components, weights and missing-data handling; a hidden formula cannot be recalculated.
A score can point to explanations worth reading. It is not a threshold for dating or marriage. Actual interaction requires the people’s expressed wishes, observed conduct and shared arrangements.
What makes a comparison understandable?
Look for the actual symbols and conditions. Are the combining stems both Day Masters, or a Year Stem (the upper symbol in the birth-year column) and a Month Stem (the upper symbol in the birth-month column)? Is the contact natal or supplied by a year? Does favorable Fire refer to climate or strength balancing? A conclusion without those details leaves the reader unsure which layer it describes.
The explanation should also accommodate differences: some symbols may combine, others clash, and the Day Branches may have no named pair. Averaging everything into “moderate affinity” discards the information you could understand.
What can this help you discuss?
If a reading describes support or restraint, make the question specific. Is the wanted support listening, sharing tasks or reminding someone of a deadline? Does the other person want that role? Those answers come from conversation, not from a Ten God (one of ten traditional relationship labels defined relative to the birth-day element) speaking for someone.
The vocabulary can open a discussion. If it does not fit the people’s experience, keep that mismatch visible. Neither person needs a personality or ending assigned to make the chart appear correct.
Can charts be compared without a birth time?
First identify what is missing. A verified date with an unknown time differs from uncertainty about lunar versus solar dates or conflicting date records. The former may retain confirmed pillars while leaving the Hour Pillar and dependent claims unknown. The latter may leave the Day Master and Spouse Palace unresolved too.
For a documented time range, calculate the relevant alternatives under one calendar rule, then distinguish stable and variable results. If the range crosses two hour periods, show the two possible Hour Pillars instead of selecting the one that fits a personality story. Without supporting records, do not supply a supposedly likely time.
When the time is unknown, Clarify may use noon as a flagged placeholder for part of its solar-term (one of 24 seasonal markers defined by the Sun’s position along its yearly path) calculation; the unknown Hour Pillar remains empty. The placeholder is not the actual birth time. Approximate terms and rounded starting ages also limit cycle precision, so an age band in the interface is not an exact handover date.
| Input condition | Scope that can be described |
|---|---|
| Verified date, unknown time | Keep confirmed Year, Month and Day Pillars; check unresolved boundary cases. |
| Conflicting date or calendar | Check original records; where needed, show the different date scenarios. |
| Only one person’s chart | Explain that chart; do not score the absent person. |
| Information declined | Stop the comparison that requires it; discuss the actual question. |