Astrology • Relationship Insights

Free Synastry Chart Calculator

Enter the birth details for two people to generate a detailed, client-side synastry reading with planetary sign placements, major aspects, compatibility scoring, and practical relationship guidance.

Person A

Birth details used for natal chart approximation and synastry scoring.

Chart A
 
 
 
 
 

Person B

Match a city and country from the atlas for best timezone conversion.

Chart B
 
 
 
 
 

Calculate Compatibility

The calculator derives planetary longitudes, zodiac placements, major cross-chart aspects, and weighted compatibility scores.

Client-side only
 
Overall Compatibility
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Compatibility Meter

Animated harmony score based on the strongest synastry contacts.

 

Emotional

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Romantic

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Communication

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Trust

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Long-Term

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Person A Placements

 

 

Person B Placements

 

 

Relationship Summary

 

Personalized Relationship Advice

 

Emotional Analysis

 

Romantic Analysis

 

Communication Analysis

 

Long-Term Compatibility

 

Positive Aspects

Supportive and harmonious contacts between the charts.

 

Challenging Aspects

Growth areas that may require patience or conscious effort.

 

Planetary Aspect Table

Major synastry aspects detected between the two natal charts.

Aspect Angle Orb Influence Tone

What Is a Synastry Chart?

A synastry chart compares two birth charts to reveal the unique dynamics of your relationship. Going far beyond basic zodiac sign compatibility, it examines how your individual charts interact—offering deeper insight into your emotional connection, communication, romantic potential, and shared life path.

It also analyzes house overlays, showing how each partner influences important areas of the other’s life, including love, self-expression, communication, personal growth, and emotional well-being.

How Our Synastry Calculator Works

Enter your birth date, time, and place along with your partner’s and we’ll compare your natal charts using trusted astrological compatibility techniques.

Discover how your unique energies align and gain deeper insight into your relationship, including:

  • Emotional compatibility and attachment dynamics
  • Communication style and mental connection
  • Romantic chemistry and long-term relationship potential

  • Shared strengths and opportunities for growth

Why Synastry Chart Compatibility Matters

Every relationship has its unique dynamics—and birth chart compatibility helps you understand them on a deeper level. Rather than relying on guesswork, synastry reveals the patterns behind your connection, showing where you naturally align, where challenges may arise, and how you can grow together.

Whether you’re exploring a new relationship or looking for greater clarity in an existing one, compatibility insights can help you approach your connection with deeper understanding, confidence, and intention.