Zodiac Compatibility Calculator
Enter two birth dates to reveal your star-sign love match — instantly and for free.
How zodiac compatibility is calculated
Every birth date falls under one of the twelve star signs, and each sign belongs to one of four elements: fire (Aries, Leo, Sagittarius), earth (Taurus, Virgo, Capricorn), air (Gemini, Libra, Aquarius), and water (Cancer, Scorpio, Pisces). Astrologers have long held that elements shape how two people click.
This calculator maps each birth date to its sign, looks at how the two elements relate, and turns that into a percentage. Signs that share an element tend to understand each other instinctively. Fire and air energize one another, and earth and water nurture one another, so those pairings score highly too. Opposite pairings such as fire and water can be more challenging — though in real life, any two signs can make it work.
Because the formula is fixed, the same two signs always produce the same score, so you can compare results with friends.
Frequently asked questions
How is zodiac compatibility calculated?
Each birth date maps to a star sign, and each sign has an element. Shared or harmonizing elements score higher. A fixed formula means the same two signs always give the same result.
Which star signs are most compatible?
Same-element pairs get along easily; fire pairs well with air, and earth with water. Opposite elements like fire and water are more challenging — but any pairing can work in real life.
Is it free?
Yes — completely free, runs in your browser, works on any device, no sign-up.