Zodiac Compatibility Calculator

How two hearts meet, by sun sign, moon, rising or full birth chart.

Calculated in your browser. Birth details are never stored.

What is zodiac compatibility?

Zodiac compatibility is a way of looking at how two people's astrology fits together. At its simplest it compares your sun signs, the headline sign most people know. Going deeper, it looks at the relationship between two whole charts, the moon signs that hold your feelings, the rising signs that shape how you meet the world, and the planets of love and desire. It is a lens for understanding, not a verdict, and no pairing is ever simply right or wrong.

How this compatibility calculator works

Astrologers read compatibility largely through the angle between two signs, and that is what this calculator measures. Signs of the same element sit in a flowing trine and tend to understand each other instinctively. Signs three apart form a square, full of friction that can spark either passion or a power struggle. Signs opposite each other are drawn together like magnets and spend a lifetime learning balance. On top of that angle, the calculator weighs the two elements, fire, earth, air and water, and the two modalities, cardinal, fixed and mutable, to shape the final reading.

  • Sun sign compares your core selves, the classic starting point.
  • Moon compares your emotional worlds and how you comfort one another.
  • Rising compares your everyday styles and first impressions.
  • Full chart blends the sun, moon, rising, Venus and Mars for a rounded picture of love, feeling and desire.

Is sun sign or moon sign more important for love?

Both matter, and they answer different questions. Your sun sign compatibility describes how your core characters meet, the broad chemistry. Your moon sign compatibility is often the quieter truth of a long relationship, because the moon rules emotional needs, comfort and the way you each feel safe. Two people whose suns clash can be wonderfully at home with each other if their moons agree. For the fullest picture, calculate both whole charts and read them together. You will need a birth time for the moon, rising and full chart modes, which you can find on a birth certificate. To explore a single chart in detail first, try our free birth chart calculator.

The most compatible zodiac signs

As a rule of thumb, signs of the same element flow most easily: the fire signs Aries, Leo and Sagittarius; the earth signs Taurus, Virgo and Capricorn; the air signs Gemini, Libra and Aquarius; and the water signs Cancer, Scorpio and Pisces. Fire and air feed each other, and earth and water nourish each other, so those cross pairings tend to be warm too. Yet some of the most enduring loves sit in a square or an opposition, where difference becomes the very thing that keeps a couple curious. Compatibility is a starting point for understanding, never a wall.

A gentle note

Astrology is a language of symbols and a mirror for reflection, not a science of cause and effect, and a chart can never decide whether two people belong together. Only you can know that. Read your result as a way to understand each other more kindly, take what rings true, and leave the rest. The healthiest love is built less on a perfect score than on honesty, attention and care.

Zodiac compatibility calculator FAQ

How is zodiac compatibility calculated?

Mainly through the angle between two signs. Signs of the same element form a harmonious trine, signs three apart form a charged square, and opposite signs attract and balance. This calculator weighs that angle along with the two elements and modalities to produce a reading and a score, for the sun sign or for whole charts.

Is sun sign or moon sign more important for compatibility?

Both matter. The sun sign shows how your core characters meet, while the moon sign shows your emotional needs and how safe you feel together, which often matters more over time. For the fullest picture, compare whole charts and read the sun and moon together.

Can two of the same star sign be compatible?

Yes. Two of the same sign understand each other instinctively, like looking in a mirror. It can be deeply comfortable, though you may share the same blind spots, so it helps when one of you can play the calm, balancing role.

Which zodiac signs are most compatible?

As a guide, signs of the same element flow most naturally, and fire pairs well with air while earth pairs well with water. Even so, squares and oppositions produce some of the most passionate and lasting couples, so treat element matches as an easy start rather than the only good option.

Do zodiac signs really matter in love?

There is no scientific evidence that star signs determine compatibility. What astrology offers is a shared language for talking about your differences and needs with more warmth and curiosity, which can genuinely help a relationship. Read it as a mirror, not a rule.

Do I need a birth time to check compatibility?

Not for the sun sign comparison, which only needs both birthdays. The moon, rising and full chart modes use a birth time to place the moon and rising signs accurately. You can usually find your time of birth on your birth certificate.