astrology · natal chart · accurate ephemeris
Free Birth Chart Calculator
Build a tropical natal chart from your exact birth date, time and place. The result shows the Big Three, ten planet placements, whole-sign houses, major aspects and a readable chart wheel — without an account or upload.
Enter birth details
What your birth chart contains
A natal chart is a map of where the Sun, Moon and planets appeared along the zodiac at one moment. Astrology treats each layer as a different question: planets describe the function, signs describe its style, houses describe the life area, and aspects describe how two functions meet. The map does not measure personality scientifically and it does not remove choice; use it as a symbolic vocabulary for reflection.
The Big Three
The Sun is the centre you grow toward, the Moon describes emotional needs and recovery, and the Ascendant is the degree rising in the east — the way you meet new experience. The Ascendant needs coordinates and an accurate time.
Planets and aspects
Mercury speaks to thought and language, Venus to relating and value, Mars to drive, Jupiter to expansion and Saturn to structure. Uranus, Neptune and Pluto move slowly and often describe a generational background. Major aspects show their closest angular relationships.
How this calculator stays accurate
Planet positions come from the open-source Astronomy Engine ephemeris. The Ascendant is calculated from UTC time, geographic coordinates, Earth rotation and the true ecliptic of date. Houses use the whole-sign system: the complete rising sign is house one, the next sign house two, and so on. Different house systems can move cusps while leaving planet signs unchanged.
Birth data stays on this device: the calculation runs locally in your browser. Astronomy code: Astronomy Engine (MIT).