Free Zi Wei Dou Shu Calculator — How to Read Your Chart
> 本篇為英文讀者而設。中文讀者可參考:紫微命盤怎麼看、紫微流年怎麼看。
Searching for a Zi Wei Dou Shu calculator usually lands you on one of two things:
a bare chart plotter that dumps 12 palaces of Chinese characters on you, or a
paywalled reading service. This guide explains what the chart actually is, how to
read the key parts in five minutes, and where to get one computed properly — for free.
What a Zi Wei Dou Shu chart is
Zi Wei Dou Shu (紫微斗數, "Purple Star Astrology") is a deterministic system:
given your birth year, month, day, hour and gender, there is exactly one correct
chart. Twelve palaces — Self, Siblings, Spouse, Children, Wealth, Health,
Travel, Friends, Career, Property, Fortune, Parents — each host a set of stars.
The Self Palace (命宫) is the anchor: its stars describe your core pattern.
If two calculators give you different charts for the same input, at least one is
computing wrong — usually because of true-solar-time or daylight-saving
corrections, not "a different school of interpretation."
The five things to read first
- Self Palace stars — your baseline character and life pattern.
紫微 (Zi Wei, the Emperor Star) reads very differently from 七杀 (Qi Sha).
- Body Palace (身宫) — where your effort actually goes in life.
- Birth-year transformations (生年四化) — four stars activated as
祿/權/科/忌 (gain, power, refinement, obstruction). The palace hosting your
忌 is your lifetime friction point.
- The Self Palace's three-and-four corners (三方四正) — Self + Career +
Wealth + Travel form your structural pattern.
- Current decade (大限) — the chart cycles through palaces every ten years;
your current decade frame matters more than any single star.
Why "just ask ChatGPT" doesn't work here
Large language models are excellent at *explaining* a chart — and unreliable at
*computing* one. Ask an LLM to place your stars directly and it will confidently
produce a plausible-looking chart with stars in wrong palaces. On Ming Luo Pan the
computation is done by a deterministic engine (same input, same chart, every time),
and AI is only used to *interpret* verified chart facts — which are shown on the
result page, so you can check anything the reading claims.
Getting your chart free
The free Zi Wei calculator takes Gregorian birth data plus birth
place, applies true-solar-time and historical DST correction for HK/TW/CN/MO,
and renders the full 12-palace chart in English. First-time registrants get free
AI readings on top of the chart itself.
Common pitfalls
- Wrong hour pillar: charts change at hour boundaries (each 時辰 = two hours).
Born near one, or during a DST era (Hong Kong had DST until 1991)? Solar-time
correction matters.
- Reading stars in isolation: read formations before individual stars.
- Treating the chart as verdict: it's a map of tendencies — a mirror, not a cage.