Free Western Astrology Synastry & Compatibility Calculator

Discover your relationship dynamics. Calculate and compare your Sun, Moon, and Rising signs (The Big Three) for romance, business, and wealth compatibility.

Western Astrology Compatibility

Analyze your Big Three to see how your core personalities and emotions interact.

Person A

Person B

What is Synastry (Astrology Chart Matching)?

Synastry is the advanced art of relationship astrology. Instead of just reading one birth chart, a synastry reading involves superimposing two natal charts on top of each other to see how the planets interact mathematically.

By analyzing the angles (aspects) between your planets and your partner's planets—such as Trines (harmony), Squares (friction), and Conjunctions (intensity)—you can uncover the hidden energetic dynamics that govern your connection.

Why Sun Sign Compatibility is Toxic

Popular astrology magazines might tell you that an Aries and a Scorpio are 'toxic' and should never date. This is completely false. Sun sign astrology ignores the other 90% of your chart. If an Aries has their Moon in Scorpio, they will share a profound, intuitive emotional bond with a Scorpio Sun. Real compatibility requires looking at the entire planetary matrix.

Romantic Synastry: Finding Your Soulmate

When evaluating romantic potential, astrologers look far beyond the Sun. The true markers of domestic bliss and sexual chemistry lie in the Moon, Venus, and Mars.

1. Sun & Rising (Identity & Persona)

Your Sun and Rising signs dictate how you act in the world. Compatible signs here mean you look great together as a couple, share similar life goals, and operate at a similar pace.

2. Moon Sign (Emotional Safety)

The Moon is the most critical planet for living together. It rules your subconscious and emotional needs. A harmonious Moon aspect (like Earth and Water) means you naturally know how to soothe and comfort each other.

Astrology Business Partnerships & Wealth Compatibility

Synastry is not just for lovers. If you are launching a startup or hiring a key executive, comparing birth charts can prevent disastrous conflicts. Business Synastry ensures your partner's working style complements yours.

Furthermore, we can look at Wealth Compatibility. Does your partner's Jupiter (Planet of Luck and Expansion) land in your 2nd House of Income? If so, simply being in business with them will mathematically expand your financial capacity.

Business Compatibility (Mercury & Saturn)

We analyze Mercury to ensure your communication styles align without misunderstanding, and Saturn to ensure long-term commitment and structural discipline in the business.

Wealth Synastry (Jupiter & 2nd/8th Houses)

Identifies if your partner's planets activate your personal wealth houses. Some business partners or spouses act as 'lucky charms,' directly boosting your ability to generate and retain money.

The Composite Chart: The Relationship as an Entity

While Synastry shows how Person A affects Person B, the Composite Chart is a completely new chart created by finding the mathematical midpoints between your planets. The Composite Chart represents the relationship itself as a third entity with its own destiny.

Just like individuals, relationships experience 'Astrological Transits.' If Saturn is transiting your Composite Venus, the relationship will face a period of coldness or severe testing. Knowing these timing cycles allows you to weather the storms together.

Stop Guessing. Know Your Cosmic Connection.

Our free tool above analyzes the 'Big Three'. To get a professional-grade Synastry Report that calculates all planetary aspects (Venus, Mars, Jupiter), House Overlays, and Wealth Compatibility, download the YuanYu App today.