Bazi Compatibility
Bazi Compatibility — Your Natural Match Score
Enter two birth dates. Get a free compatibility score across four relationship contexts. No account required.
Person A
Person B
Frequently Asked Questions
How is the compatibility score calculated?
The BaziGrid Bazi compatibility calculator derives three raw scores from the two birth charts. Natural Match (D1) assesses the structural interaction between the two Day Branches, scored out of 40. Mutual Support (D2) assesses whether each chart supplies what the other structurally benefits from, also scored out of 40. Active Interaction (D3) assesses the Five Element relationship between the two Day Masters, scored out of 20. Each relationship context (Romantic, Business Partner, Close Friend, Colleague) applies different weightings to these three scores to produce a context-specific score out of 100. The overall score is the simple average of the four context scores.
What does the overall score mean?
The overall Bazi compatibility score is a structural baseline across all four relationship contexts. It reflects the aggregate compatibility of the two charts, not a verdict on the relationship. A high score means the structural conditions are broadly favorable. A low score means friction is present at the structural level. In both cases, how the relationship operates in practice depends on factors the score does not map.
What is Natural Match?
Natural Match measures the interaction between the two Day Branch stems. The Day Branch is the Earthly Branch of the Day Pillar, one of the four structural pillars in a Bazi chart. Branch interactions range from Six Combination (direct structural affinity) to Clash (direct structural opposition). The detected interaction type maps to a raw score, which is then weighted per context to produce the Natural Match contribution to each context score.
What is Mutual Support?
Mutual Support measures whether the two charts supply what each other structurally benefits from, assessed in both directions. A high score means both charts naturally support the other's operating requirements. A low score means one or both charts generate conditions that work against the other. The assessment covers five tiers, from strong mutual provision to strong conflict.
What is Active Interaction?
Active Interaction measures the Five Element relationship between the two Day Masters. The Day Master is the Heavenly Stem of the Day Pillar and the core operating element of a Bazi chart. Three relationship types are possible: Generative (one Day Master produces the other's element), Peer (both share the same element), or Control (one Day Master exerts structural pressure on the other). Each type produces a different raw score.
Do I need a birth time to get a score?
Birth time is optional. Natural Match and Active Interaction use the Day Pillar only and are not affected by birth time. Mutual Support benefits from birth time when available: with a full chart (all 8 characters), the element provision assessment is more accurate than with the Day Pillar alone. If birth time is not provided, the calculator notes this on the results page and the score remains valid at a reduced level of precision.
What does a low score actually mean?
A low score means structural friction is present between the two charts. It does not mean the relationship cannot work. Bazi maps structural conditions, not outcomes. Effort, communication, shared history, and deliberate management are not captured in the score. Many strong long-term relationships carry significant structural friction. The score is a starting point for understanding the underlying conditions, not a recommendation.
Why is the score different for Romantic versus Business?
Each relationship context applies different weightings to the three dimensions. Romantic compatibility weights Natural Match (D1) most heavily, reflecting that root-level structural affinity matters most in a close personal partnership. Business compatibility weights Mutual Support (D2) most heavily, reflecting that operational complementarity is the primary driver in a working relationship. The raw scores are the same across all contexts. Only the weightings change.
Is this the same as Chinese zodiac compatibility?
No. Chinese zodiac compatibility uses the Year Branch only, which is shared by everyone born in the same year. Bazi compatibility uses the Day Branch and Day Master, which are specific to the individual birth date. Two people born in the same year will have the same Chinese zodiac sign but different Bazi Day Pillars. The Day Pillar is a more precise and individual structural indicator than the Year Branch.
Is this the same as Four Pillars compatibility?
Yes. Four Pillars and Bazi refer to the same system. "Four Pillars of Destiny" is the full English translation of Bazi (八字), which maps behavioral architecture from four structural pillars derived from the birth date and time. BaziGrid uses Bazi throughout, but the methodology is identical to what is referred to as Four Pillars compatibility in other contexts.