How do you calculate zodiac compatibility?
Choose your sun sign and the other person’s sign. You can also enter birth dates to select the usual western tropical zodiac signs automatically. Near sign transition dates, the exact result may depend on birth year, time and location.
The calculator combines two traditional astrological conventions: the four elements (Fire, Earth, Air and Water) and three modalities (cardinal, fixed and mutable). Each pair receives a consistent entertaining index and an explanation.
Fire, Earth, Air and Water in astrology
Aries, Leo and Sagittarius are traditionally Fire signs, linked symbolically with drive and spontaneity. Taurus, Virgo and Capricorn are Earth signs, commonly linked with patience and practical concerns.
Gemini, Libra and Aquarius are Air signs, associated in astrology with curiosity and communication. Cancer, Scorpio and Pisces are Water signs, linked with emotion and intuition. These descriptions are cultural symbolism, not scientific personality measures.
What are cardinal, fixed and mutable signs?
The cardinal signs are Aries, Cancer, Libra and Capricorn. Fixed signs are Taurus, Leo, Scorpio and Aquarius. Mutable signs are Gemini, Virgo, Sagittarius and Pisces. Astrology traditionally connects them to initiative, determination and adaptability.
The calculator uses these categories as part of a simplified reading. It does not calculate birth charts, rising signs, Moon signs or Venus placements. Those would require different inputs and astronomical calculations.
Can astrology predict a successful relationship?
No. There is no convincing scientific evidence that zodiac signs predict whether a couple will be happy or stay together. People whose signs are said to clash can still build wonderful relationships.
The percentage is a playful convention based on traditional associations, not a success probability. If you want to explore actual preferences, try our relationship compatibility quiz instead.
Try next: love compatibility quiz.
Frequently asked questions
Which zodiac signs are most compatible?
Tradition often pairs Fire with Air and Earth with Water, but astrological schools vary, and no sign pairing predicts romantic success.
Can I use birth dates instead of choosing signs?
Yes. Birth dates automatically select sun signs using common western tropical zodiac date ranges.
Does swapping the two signs change the score?
No. Both signs form one unordered pair, so the symbolic score is the same either way.
Does 80% mean an 80% chance of relationship success?
No. The value is an entertainment index based on astrological conventions, not a measured probability.
Does this calculate rising signs or Venus compatibility?
No. Only sun signs, elements and modalities are included.