Zodiac Compatibility Calculator

Zodiac compatibility, also known as synastry in Western astrology, examines how two Sun signs interact across multiple dimensions of relationship energy. While a full astrological compatibility analysis requires complete birth charts including Moon, Venus, Mars, and 7th house placements, Sun sign compatibility provides a meaningful starting point for understanding the fundamental dynamic between two personality types and their natural tendencies in partnership.

This tool evaluates compatibility across five weighted factors that astrologers traditionally consider most significant. Sign-to-sign compatibility (35% weight) examines the geometric relationship between signs — trines (120°) flow naturally, sextiles (60°) are stimulating, squares (90°) create dynamic tension, and oppositions (180°) offer magnetic attraction with polarity challenges. Element harmony (25% weight) assesses whether your core natures support each other: Fire feeds Air and vice versa, while Water nourishes Earth and Earth contains Water.

The energy dynamic between modalities (Cardinal, Fixed, Mutable) reveals how you approach life together — two Cardinals may compete for leadership, two Fixed signs show unwavering loyalty but mutual stubbornness, while Mutable signs adapt easily but may lack direction. Polarity attraction examines the Masculine (Yang) and Feminine (Yin) interplay, and planetary ruler relationships reveal whether your governing planets are natural allies, neutral, or in tension.

Important to remember: Sun sign compatibility shows general tendencies, not destiny. Challenging aspects between signs often produce the most transformative and passionate relationships when both partners commit to growth. Many of the zodiac's "power couples" in real life are technically "difficult" matches on paper — the friction creates chemistry and evolution. Use this analysis as awareness, not as a verdict on your relationship's potential.