Free Synastry Chart Calculator

Explore your relationship compatibility with our free synastry chart calculator.

Compare two birth charts to uncover emotional connection, romantic chemistry, communication, strengths, challenges, and long-term potential.

Your Details

Person 1
Birth Time

Partner's Details

Person 2
Birth Time
Two overlapping celestial charts centered on the Moon and Sun
What Is a Synastry Chart in Astrology?

A deeper look at how two birth charts connect

A synastry chart compares two people's natal charts to explore their astrological compatibility and relationship dynamics.

  • Planetary Aspects: Explore how planets in two birth charts interact through conjunctions, trines, squares, and other aspects, revealing attraction, harmony, and tension.
  • House Overlays: Discover which areas of life you activate in each other, from romance and intimacy to communication, commitment, and personal growth.
  • Relationship Compatibility: Understand your emotional connection, romantic chemistry, communication styles, strengths, and potential challenges through synastry astrology.
How Our Synastry Chart Calculator Works

Discover your relationship compatibility in three steps

01

Enter Both Birth Details

Provide both people's birth dates, exact birth times, and birthplaces to ensure accurate planetary positions and house placements.

02

Generate Your Synastry Chart

Our calculator compares both natal charts, mapping planetary aspects and house overlays to reveal how your planets interact.

03

Explore Your Relationship Compatibility

Discover your romantic chemistry, emotional connection, attraction, relationship strengths, and potential challenges through a personalized synastry reading.

Why Your Synastry Chart Matters

See your relationship more clearly through astrology

Understand Your Connection

Discover how your planets interact to shape emotional closeness, romantic attraction, chemistry, and the qualities that naturally draw you together.

Explore Your Relationship Dynamics

See how planetary aspects and house overlays influence communication, intimacy, shared needs, and the roles you play in each other's lives.

Navigate Challenges and Grow Together

Recognize areas of harmony and tension so you can better understand recurring patterns, approach differences with awareness, and explore your long-term potential.