Free Birth Chart Calculator

A natal birth chart is a map of the sky for your birth date, time, and location. It plots the Sun, Moon, and planets against the tropical zodiac, the Western zodiac that anchors 0° Aries to the March equinox, and divides the local sky into twelve houses. Exact birth time matters most for the Ascendant, houses, Vertex, and other angles. If you want to see how those same placements shift in a star-referenced frame, compare them with the tropical vs sidereal chart calculator.

Each planet placement includes its zodiac sign, degree, house position, and essential dignity. Dignities (domicile, exaltation, detriment, and fall) describe how comfortably a planet operates in a given sign. A planet in domicile (the sign it rules) has a stronger claim to act according to its own nature; one in detriment or fall has more contrary testimony to consider. These distinctions matter for interpretation: Mars in Aries (domicile) expresses very differently from Mars in Libra (detriment).

This birth-chart tool presents the standard natal chart view. For side-by-side house systems, use the house system comparison calculator, which compares Placidus, Whole Sign, Equal, Porphyry, Koch, Alcabitius, Regiomontanus, and Campanus. Planetary positions are computed from JPL-backed ephemeris data, while houses and angles remain as accurate as the birth time and location you provide.

Start with the "Big Three": your Sun sign (core identity), Moon sign(emotional nature), and Ascendant or rising sign (how the world sees you). These three placements form the foundation of your chart. The Sun and Moon are the luminaries, the two most personal points, while the Ascendant sets the entire house structure and determines your chart ruler.

Next, look at the houses. Each of the twelve houses describes a life area: the 1st house is self-image, the 4th is home and family, the 7th is partnerships, the 10th is career and public reputation. Planets in a house bring their energy to that domain. An empty house isn't inactive; its themes are colored by the sign on the cusp and the condition of that sign's ruler elsewhere in the chart. To see which house themes are most active for you right now, try the profection year calculator.

Finally, examine the aspects, geometric angles between planets that show how their energies interact. Conjunctions (0°) merge planetary energies. Trines (120°) and sextiles (60°) are usually read as easier connections. Squares (90°) and oppositions (180°) describe friction or polarity. Tight orbs, especially under 3°, usually carry more weight than looser contacts.

This calculator also computes your Vertex and Anti-Vertex, two sensitive points that require an exact birth time to determine. The Vertex is found where the prime vertical intersects the ecliptic in the western hemisphere of your chart, always falling between the 5th and 8th houses. Astrologers call it the point of fate in modern practice, but it is better treated as a sensitive relational point than as proof that an encounter is destined.

In synastry, a partner's planet conjunct your Vertex is often read as a notable contact, especially with a tight orb, but it does not determine the relationship by itself. The Anti-Vertex, exactly opposite, completes the same axis. For a focused view of just these points, try the dedicated Vertex calculator.