Zi Wei Dou Shu Calculator & Chart
Enter birth date and hour to build a Purple Star chart with twelve palaces, decade cycles and major stars. Calculation is free and deterministic; optional AI analysis reads the visible chart without changing it.
Birth details
What this Zi Wei Dou Shu Calculator gives you
The twelve palaces, laid out
Life, Wealth, Career, Spouse and the rest — each palace drawn with the stars that landed in it. The full grid, not a summary.
Fourteen major stars, four transformations
Every major star is placed by rule, and the four transformations are marked on the chart — with the exact table we used named underneath.
Decade limits drawn on the chart
The ten-year limits sit on the palaces they pass through, with ages attached — not in a separate table you have to map back yourself.
School choices written out
Late Zi hour, transformation table, empty-palace borrowing — every school-level choice is listed under the chart so you can reconcile it with another calculator.
How the Zi Wei Dou Shu Calculator builds a Purple Star chart
Zi Wei Dou Shu — usually called Purple Star astrology, after Zi Wei, the emperor star at the centre of the system — organizes a reading through twelve palaces rather than four pillars. Each palace covers one department of life (self, wealth, career, relationships, and so on), and the stars that land in it describe how that department tends to behave.
The chart is built from the lunar month and the two-hour birth branch. That is why the birth hour matters more here than in BaZi: the hour alone decides which palace becomes the Life Palace, and moving it by one branch rotates the entire chart.
The calculator first places the stars, palaces, cycles and each ten-year decade by rule, so the same birth data always produces the same chart. Optional AI analysis comes afterward: it reads the displayed Purple Star evidence but never changes the chart. Nothing is scored from 0 to 100, and every school-dependent choice is listed so you can reconcile it against another calculator.
A Purple Star chart: twelve palaces, one birth moment
The Life Palace is fixed by the lunar month and the birth hour together; the other palaces follow in order around the ring. Move the hour by one branch and the whole chart rotates — which is why Zi Wei insists on the hour even more than BaZi does.
From birth data to Zi Wei Dou Shu reading in three steps
- 1
Enter date, hour and gender
Zi Wei charts from the lunar month and the two-hour birth branch. Without the hour the palace layout may not be yours at all — we say so on the chart.
- 2
We place the stars by rule
The same rules, every time. AI analysis is kept separate from calculation, and no palace is scored from 0 to 100.
- 3
Compare, if you like
The same birth details carry over to the BaZi chart. The two systems answer different questions, and where they disagree is the interesting part.
FAQ
Is this Zi Wei Dou Shu calculator free?
Yes. Guests can add 1 new chart per day, free signed-in accounts can add 2, and subscribers have unlimited chart access. Reopening the same chart does not use another slot. Paid reports remain separate.
What if I do not know my birth hour?
You can still chart, but be honest about the limit: the Life Palace in Zi Wei is fixed by lunar month and birth hour together. Without the hour the palace layout may not be yours at all, so treat an hourless chart as a rough sketch rather than a reading.
Why does my chart differ from another site?
Zi Wei has no single standard. Differences almost always come from a handful of school-level choices — how the late Zi hour is handled, which four-transformation table is used, whether an empty palace borrows from its opposite. Ours are listed under the chart itself — build one and you can compare line by line.
How is this different from a BaZi chart?
BaZi reads the balance of five elements across four pillars; Zi Wei maps stars onto twelve palaces. They answer different questions, and on the same birth data they often disagree — which is useful. You can chart both here and compare them side by side.
For reflection and entertainment. Not scientific validation, and not advice.