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Synastry
Read two charts without asking for a score
Follow a clear reading order across two side-by-side BaZi charts, moving from independent pillars and Day Master relations to positional symbol pairs and optional conversation.
BaZi Two-Chart Comparison Calculator
Independently compute two Four Pillars charts to inspect their Day Master five-phase relationship alongside conventional stem and branch pairings. Built for calm reflection, this tool runs locally in your browser and assigns no compatibility score.
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Start with two moments.
Your birth details stay in memory only while this page is open. They are never uploaded, saved in your browser, or placed in share links. Clear the form when you finish on a shared device.
How the calculation works
Calculations use your recorded local clock time and IANA time zone, including historical daylight-saving rules. Astronomical solar terms set the year and month boundaries, while the day pillar changes at local midnight. No longitude-based true-solar-time correction is applied.
If your birth time falls in a daylight-saving transition, the tool will explain whether that clock time was missing or repeated. An uncertain birth time cannot give a reliable hour pillar.
The chart shows four heavenly stems and four earthly branches. Counts of their five phases describe these eight visible characters only. They do not measure overall strength, reveal hidden stems or prescribe a missing element.
TWO CHARTS. NO FIXED VERDICT.A relationship
A relationship
is more than a chart.
See the patterns side by side. Bring the conversation back to your actual lives.
A two-chart comparison you can repeat
BaZi and Four Pillars describe the same eight-character chart structure. This comparison calculates a separate Year, Month, Day, and Hour column for each person before listing traditional cross-chart relations.
To try the form without using private details, use these invented practice records. Keep each person's original local clock reading paired with their own birthplace time zone, even when the two zones differ.
| Record | Gregorian date | Local time | Birthplace time zone |
|---|---|---|---|
| Person one | 15 January 1990 | 12:00 | America/New_York |
| Person two | 20 June 1992 | 15:30 | Asia/Shanghai |
- Read the upper Day character in each chart. Record both Day Masters, including the Yin or Yang label and phase.
- Read a Day Master phase relation in the stated direction: person one to person two. Reversing the direction can change the wording. A same-phase relation does not necessarily mean the same stem.
- For each stem combination, branch combination, or opposition that appears, record its exact position in both charts, such as person one's Month and person two's Hour. Four positions in each chart create sixteen position pairs to inspect.
- If a character pair appears in several positions, keep those positions distinct. More rows do not make a stronger match. If no pairing appears, that is also a valid result of the listed rules.
- Finish with a question both people can answer from experience, such as “When do we each prefer to plan together?”
| Record | Year | Month | Day | Hour | Day Master |
|---|---|---|---|---|---|
| Person one | 己巳 | 丁丑 | 庚辰 | 壬午 | 庚 Geng, Yang Metal |
| Person two | 壬申 | 丙午 | 丁卯 | 戊申 | 丁 Ding, Yin Fire |
The Day Master relation reads Fire regulates Metal, from person two to person one. For a position example, person one's Year Branch 巳 pairs with person two's Year Branch 申 as a branch combination. Person two also has 申 in the Hour position, so that same character pairing appears again at a different position.
The relation labels are traditional descriptions for conversation and do not predict a relationship outcome. Ask before entering another person's real birth details.
Both exact local times are required. If one time is approximate, compare clearly labeled scenarios on paper. If an hour is entirely unknown, start with the birth-record guide instead of substituting noon.
Read Day Master relations and pillar pairings · Understand repeated pairs · Compare records from different time zones
Ask permission. Leave room for disagreement.
Birth details belong to the person they describe. Only compare with their permission, and let each person decide whether an interpretation feels useful. A chart is never a reason to dismiss someone’s feelings or boundaries.
An interesting pattern.
A better question.
More stories ↗02
Synastry
One Day Master, two Saturday stories
Use a shared Day Master label as the starting point for a two-person story exchange and caption activity that highlights your real, distinct Saturday preferences.
03
Synastry
Same color, different characters
Turn the distinction between two stems of the same phase into a side-by-side paper sketching game that celebrates different habits under one shared color.
Before you begin
Comparing Two BaZi Charts ↗How is BaZi chart comparison different from Western synastry?
Western synastry calculates geometric aspects between planets, signs, and house cusps. This Chinese astrology tool compares two Four Pillars calendars instead. It computes each person's BaZi chart independently, then lists the directed five-phase relation between their Day Masters alongside classical Heavenly Stem combinations and Earthly Branch combinations or oppositions.
Why doesn't the comparison give a compatibility score or verdict?
Traditional stem and branch interactions describe symbolic calendar patterns, not a scientific measurement of relationship success. A comparison may show several interactions, only one, or none at all, and an empty list is not a negative result. Listing these patterns clearly without a percentage score lets you reflect on your dynamic without treating a cultural framework as a fixed verdict.
What birth details are required, and do our inputs stay private?
Both profiles require a Gregorian birth date, local recorded time, and an explicit IANA birthplace time zone; ambiguous or unknown times are rejected so the eight characters remain exact. All calculations stay in your browser's local page memory with no accounts, server uploads, or birth details embedded in public links.