What is a synastry chart?

It is a technique that compares two natal charts, highlighting planetary aspects and house overlays to show how you energize each other.

Do I need exact birth times?

Birth times unlock accurate house placements and Ascendant connections. Without them, focus on aspects between planets, which still offer plenty of insight.

Can synastry predict success?

Synastry maps potential strengths and challenges, but the outcome depends on communication, maturity, and shared goals. Use it as a tool for awareness and intentional growth.

Free Synastry Chart Calculator

Compare two birth charts to reveal compatibility patterns and relationship dynamics.

Make an evening of it: one question, two answers.The chart is free. Open a fictional example of the optional paid reading before entering either person’s details.

Fictional charts · Amara & Elias

Mercury conjunction Mars · orb 0.49°

This pairing is a prompt about the gap between talking and acting. One person may still be explaining while the other is ready to choose a next step. Quick responses can make a conversation feel vivid. Leave enough room to finish a thought before moving on to the decision.

Do you want us to talk this through, or are you ready to decide? How can we make room for both?

Invented people and birth details; calculated chart contacts. A product example, not a customer story or a prediction.

Try the question, not a verdict.

Ask if now is a welcome time. Each person can name a real example, say the question does not fit, or pass.
Take turns: “What I heard was…” Let the other person correct you.
Choose a small action only if you both want one. No change is also an answer.

The paid reading groups your supported contacts into five themes, with reflection questions, a private in-page notebook and a browser print edition. English conversation cards are optional; you can also read alone.

Standard price $14.99; country-based price shown before purchase. One payment, no subscription. Automated symbolic reading—not counselling or a relationship assessment.

See what the reading includes →Use the full fictional example →

Use someone else’s birth details only with permission. Unknown times are welcome: do not guess. The paid report omits Moon and angle contacts involving an unknown birth time. Nothing in a chart overrides either person’s boundaries.

Person A

Birth date

Birth time (optional)

Birth location (optional)

Name (optional)

Person B

Birth date

Birth time (optional)

Birth location (optional)

Name (optional)

Free · Private · Swiss Ephemeris Accuracy

Reading your synastry score

A high compatibility index reflects supportive aspects, but the presence of tension doesn't mean a relationship is doomed. Squares and oppositions can add spark and growth when both people communicate consciously. Review the harmony vs. tension weights in the report to balance the picture and identify where to focus conversations.

Look for repeated themes—multiple supportive Venus aspects suggest natural affection, for instance.
Cross-reference challenging Mars or Saturn connections with real-life dynamics to create practical strategies.
Compare synastry with composite chart insights when you want to study the relationship as its own entity.

Synastry FAQ

What is a synastry chart?: It is a technique that compares two natal charts, highlighting planetary aspects and house overlays to show how you energize each other.
Do I need exact birth times?: Birth times unlock accurate house placements and Ascendant connections. Without them, focus on aspects between planets, which still offer plenty of insight.
Can synastry predict success?: Synastry maps potential strengths and challenges, but the outcome depends on communication, maturity, and shared goals. Use it as a tool for awareness and intentional growth.