Bazi Compatibility

Bazi compatibility — known in Chinese as 合婚 (héhūn, literally "joining marriages") — is one of the oldest uses of the Four Pillars system: comparing two people's charts to assess their match. It's also one of the most misunderstood. This guide explains what a Bazi compatibility reading actually measures, what it cannot tell you, and how to use it as a tool for understanding rather than a verdict on your relationship.

What Bazi Compatibility Actually Measures

A Bazi compatibility reading maps elemental dynamics between two complete charts. Our compatibility calculator provides a reference score for partners, friends and business collaborators. That number is a modern index defined by this site, not a classical formula, a relationship success probability or a yes/no verdict. The private analysis explains how each chart relates to the other and shows the score range across the alternative chart interpretations considered by the calculation.

The reading works by comparing three layers of interaction between the two charts. None of these layers is decisive on its own — a good reading weighs all three together and treats the result as a framework for understanding, not a prediction.

The Three Layers of a Compatibility Reading

1. Elemental Complementarity

The first layer looks at whether the two charts' Five Elements balances complement or clash. If one chart is abundant in Fire and deficient in Water, and the other chart carries a lot of Water, there's a natural complement — the second person brings what the first lacks. Conversely, two charts both abundant in Fire may amplify each other's intensity to the point of burnout. This is the broadest layer: it sets the elemental weather of the relationship.

2. Day Master Relationship

The second layer compares the two people's Day Masters — their core-self elements. Do they share an element? Does one generate the other (a nurturing dynamic)? Does one control the other (a friction dynamic)? Two Wood Day Masters understand each other intuitively; a Wood Day Master paired with a Fire Day Master creates a generating flow where the Wood person naturally supports the Fire person; a Wood Day Master paired with a Metal Day Master carries a controlling tension that requires conscious management.

3. Pillar Interactions

The third and most detailed layer looks at how the individual branches of the two charts interact through the classical relationship patterns — combinations (合), clashes (冲), and harmony triangles (三合). A combination between the two people's Day Branches (the spouse palaces) suggests natural harmony in the intimate relationship; a clash suggests an area that will need active work. Importantly, clashes are not deal-breakers — they're areas of friction that, when navigated consciously, can produce a more dynamic and resilient partnership than a chart with zero friction.

The Zodiac Animal Myth

You've probably seen the popular compatibility charts: Rat and Ox are a perfect match, Dragon and Dog are doomed. These folk compatibility systems reduce the entire Bazi chart to a single character — the Year Branch, which is just the zodiac animal — and judge compatibility from that alone. It's the equivalent of judging a relationship from sun signs alone in Western astrology: entertaining, occasionally insightful, and wildly oversimplified.

A real Bazi compatibility reading never judges from the zodiac animal alone. The Year Branch is the smallest, most public layer of a chart. Two Dragons can be utterly incompatible if their Day Masters clash and their element balances fight. Two people whose zodiac animals "clash" can have a deeply complementary relationship when the full charts are read. Treat the folk compatibility charts as icebreakers, not oracles.

What Bazi Compatibility Cannot Tell You

The standalone compatibility tool, also listed in Tools, shows the total reference score and the method's limits without requiring sign-in. A detailed analysis requires you to sign in and have an available purchased compatibility credit. You choose two charts saved in your account, and you can find the report in My Reports alongside the chart facts and calculation results used to create it. Partner, friendship and business readings share one structural score but address different practical questions; none recommends marriage, separation or a business decision from a number.

Using Bazi Compatibility Responsibly

If you want to explore Bazi compatibility with a partner, here's the responsible way to use it:

1. Start with two complete charts. Understand each Day Master, season and structure before comparing. The compatibility tool requires both known birth times and locations. You can enter them for a guest score or choose charts you manage after signing in; birth details and private analysis never enter the URL.
2. Use another person's data only with permission. Birth date, time, and place are personal information. Do not save or compare a partner's chart without their knowledge and consent.
3. Look for complementarity, not perfection. No two charts are a "perfect match." Look for where one chart's strengths balance the other's weaknesses — that's the gold.
4. Treat friction as information, not as a red flag. A clash between Day Branches doesn't mean the relationship is doomed; it means that area will require conscious work. Every strong relationship has friction points.
5. Never use Bazi to override your own judgment. If your charts clash but your relationship is healthy, trusting the relationship over the chart is the right call. Bazi is a perspective, not a referee.
6. Bring it up with care. If you share Bazi insights with a partner, frame it as curiosity about your dynamic, not as a test of whether you "should" be together.

Starting With Your Own Chart

Before comparing two charts, you need to understand your own. Generate your free Bazi chart and read about your Day Master, your dominant archetypes, and your current Life Chapter. Once you understand your own patterns, you'll have the vocabulary to think about how they interact with someone else's — and the perspective to remember that a chart is a map, not a verdict.

To go deeper: read about your Day Master (the core self each chart is built around), the Ten Archetypes (how each character relates to your Day Master), or start from the beginning with what Bazi is.