Astrology Compatibility Calculator
Enter two sets of birth details to discover how your charts align across passion, communication, trust, and emotional connection.
Synastry Chart Calculator
Compare two birth charts to explore relationship compatibility and cosmic connections
What Is Astrological Compatibility?
Astrological compatibility (called "synastry" in professional astrology) compares two people's birth charts to understand the dynamics of their relationship. It looks at how your planets interact with your partner's planets — creating harmony, tension, attraction, and growth.
Unlike Sun sign compatibility (which only compares your zodiac signs), a full compatibility analysis examines every planetary connection: how your Moon interacts with their Venus, how your Mars aligns with their Jupiter, and dozens of other combinations that shape your relationship.
The most important compatibility factors are Moon-Moon aspects (emotional understanding), Venus-Mars aspects (physical attraction and love language), and Mercury-Mercury aspects (communication style). A relationship can have challenging Sun signs but excellent Venus-Mars chemistry.
This calculator provides a quick overview score. For the complete picture with every aspect explained, use our full Synastry Calculator.
Sun Sign Compatibility vs. Full Chart Analysis
Sun sign compatibility is a simplified starting point — it compares your core identities. But real relationships are far more complex. Two people with "incompatible" Sun signs can have an incredible relationship if their Moon, Venus, and Mars signs align well.
A full synastry (chart comparison) analysis examines 40+ planetary aspects between two charts, revealing specific strengths and challenges in your relationship. It's the difference between asking "are Aries and Cancer compatible?" and asking "are WE compatible?"