Zodiac Compatibility Calculator
Check astrological compatibility between any two zodiac signs.
Returns love, friendship, and communication scores with strengths and element analysis.
Astrological compatibility assesses the relationship potential between two people based on their zodiac signs and, in more detailed systems, their full natal charts. While not scientifically validated, billions of people use astrology as a framework for self-reflection and relationship insight.
Formula (simplified compatibility scoring): Compatibility Score = Elemental Harmony Score + Modality Score + Aspect Score
Element groups and harmony: The 12 zodiac signs are divided into four elements:
- Fire: Aries, Leo, Sagittarius
- Earth: Taurus, Virgo, Capricorn
- Air: Gemini, Libra, Aquarius
- Water: Cancer, Scorpio, Pisces
Elemental compatibility matrix:
| Your Element | Best Match | Good Match | Challenging |
|---|---|---|---|
| Fire | Fire (same) | Air (fans flames) | Water (dampens) |
| Earth | Earth (same) | Water (nourishes) | Air (erodes) |
| Air | Air (same) | Fire (energizes) | Earth (stifles) |
| Water | Water (same) | Earth (contains) | Fire (evaporates) |
Modality types:
- Cardinal (initiators): Aries, Cancer, Libra, Capricorn
- Fixed (stabilizers): Taurus, Leo, Scorpio, Aquarius
- Mutable (adapters): Gemini, Virgo, Sagittarius, Pisces
Cardinal + Mutable = good balance. Fixed + Fixed = power struggles possible but intense loyalty.
Aspect compatibility (sun sign angle). Count the signs between the two, going the short way round the wheel. These are the exact adjustments the calculator applies:
| Signs apart | Aspect | Adjustment |
|---|---|---|
| 0 | Conjunct (0°). Intense, mirrored energy, can be too similar | +5 |
| 1 | Semi-sextile (30°). Adjacent signs, little in common | 0 |
| 2 | Sextile (60°). Easy, harmonious, friendly | +10 |
| 3 | Square (90°). Tension and friction, challenging but growth-inducing | −8 |
| 4 | Trine (120°). Flowing, natural ease, the highest compatibility | +15 |
| 5 | Quincunx (150°). Awkward, nothing shared in element or mode | 0 |
| 6 | Opposition (180°). Magnetic attraction, complementary opposites | −5 |
The square is scored harder than the opposition on purpose. Opposite signs at least share a mode and pull toward each other; a square shares nothing and grinds.
Worked example: Aries (Fire, Cardinal) + Sagittarius (Fire, Mutable):
- Elemental harmony: Fire + Fire = 85 points
- Modality: Cardinal + Mutable (different modalities complement each other) = 80 points
- Aspect: 4 signs apart = Trine = +15 bonus
- Love blends element and modality 60/40 and adds the full bonus: 51 + 32 + 15 = 98
- Friendship and communication weight the same pieces differently, landing at 90 and 94
- Overall score: ~94%, highly compatible
Important note: Professional astrologers use the entire natal chart, meaning moon sign, rising sign, Venus, Mars, and planetary aspects, rather than sun signs alone.
Sun sign compatibility is a starting point, not the whole picture.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
SuperGlobalCalculator is independently built and maintained. See how we build and verify our calculators.
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