Synastry Chart & Love Compatibility Calculator
Enter two birth dates to compare your Sun, Moon, and Rising signs, get an instant compatibility score, and unlock a full synastry reading.
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Synastry Chart & Love Compatibility Calculator
A synastry chart is the astrologer's tool for relationship compatibility, it overlays two people's birth charts to reveal how their energies meet, attract, and challenge each other. This free calculator compares your Sun, Moon, and Rising signs with your partner's, gives you an instant compatibility score, and lets you unlock a full synastry reading.
How to read your synastry & compatibility
Start with the Sun signs for your core compatibility, then look at your Moon signs for emotional connection and your Rising signs for that first spark and everyday fit. Elements tell the story fast: Fire and Air energize each other, Earth and Water nourish each other, while opposite elements create the friction that can mean either passion or growth work.
Love compatibility by date of birth
You can compare love compatibility by date of birth alone, your Sun and Moon signs already reveal a great deal. Adding birth times sharpens the Rising sign and the deeper synastry. Whether you are checking a new crush, a long-term partner, or a possible twin flame, the calculator gives you an honest read on where you flow and where you will need to meet in the middle.
Your score, then the full story
The compatibility score and element breakdown are free. For the real depth, how your two charts actually weave together in love, communication, and the long run, unlock your personalized synastry reading. You can also explore each person's chart with our Sun, Moon & Rising calculator or check zodiac sign compatibility.
How to Read a Synastry Chart, Step by Step
Reading synastry is about layers. Start with the Sun signs to gauge core compatibility and shared direction. Move to the Moon signs for emotional safety, the part of a relationship that decides whether you can truly relax around each other. Then look at the Rising signs for that first spark and the everyday rhythm of being together. From there, deeper synastry weighs how each person's planets touch the other's, where you energize each other, where you challenge each other, and where you simply fit.
The most important synastry connections
A handful of contacts do most of the heavy lifting in romantic compatibility. Sun and Moon between two charts is one of the most enduring signs of a lasting bond, a natural meeting of identity and emotion. Venus and Mars governs attraction and chemistry, the magnetic pull between you. Moon and Moon shows how instinctively you understand each other's feelings. And Saturn contacts, often misunderstood, are what give a relationship weight, commitment, and staying power. A strong relationship usually has a blend of easy, harmonious links and a few growth-bringing ones.
Synastry chart vs composite chart
People often confuse the two. A synastry chart compares two separate birth charts to show how you affect each other, person to person. A composite chart merges both charts into a single new one that represents the relationship itself, as its own entity with its own purpose. Synastry answers, how do we relate? Composite answers, what is this relationship for? Both are valuable, and synastry is the natural place to begin.
What makes two charts compatible?
Compatibility is less about a perfect score and more about balance. Charts that flow too easily can lack the friction that fuels growth, while charts that are all challenge can feel exhausting. The strongest pairings usually mix harmonious elements (Fire with Air, Earth with Water) for natural ease, with a few squares or oppositions that keep things alive. Your compatibility score above gives you the headline; a full reading explains the story behind it.
Frequently Asked Questions
A synastry chart compares two people's birth charts to reveal the dynamics between them, how your Sun, Moon, Rising and other placements interact. It is the astrological tool for relationship compatibility.
Compare Sun signs (core compatibility), Moon signs (emotional connection), and Rising signs (first attraction). Harmonious elements flow easily; challenging pairings show where effort is needed.
Yes. Sun and Moon signs come from birth dates alone. Adding birth times makes the Rising sign and full synastry more precise.
Yes, your compatibility score and sign comparison are free with no sign-up. An optional in-depth synastry reading is available if you want the full story.
