Free Zi Wei Dou Shu Chart Calculator
Enter your birth date, time and place to get a 12-palace Purple Star Astrology chart with 14 major stars, minor stars, the four transformations (Hua Lu, Quan, Ke, Ji) and true-solar-time correction. Everything is calculated in your browser; your birth data is never uploaded.
What is Zi Wei Dou Shu?
Zi Wei Dou Shu (紫微斗数), literally "Purple Star Astrology", is a Chinese natal-chart system that maps the stars at your birth moment into twelve life palaces — personality, career, wealth, marriage, health, travel and more. Unlike Western astrology's planetary positions, it uses 14 major stars placed by your lunar birth date and birth hour.
How our calculator works
Charts are generated with the open-source iztro engine and the lunar-javascript calendar. We publish our calculation conventions (true solar time, leap months, early/late Zi hour) and validated the engine against 3,000 random birth data sets.
Learn the stars
Browse the encyclopedia: every major star in every palace, the four transformations in each palace, and classic star pairs.