Is this Zi Wei Dou Shu calculator accurate?

The chart itself — the placement of all 14 major stars, 12 palaces, and the Four Transformations — is calculated deterministically from your birth data using the same lunar-calendar and star-placement algorithms used in professional Zi Wei Dou Shu software, not an AI guess. Accuracy of the underlying chart depends entirely on the accuracy of your birth date, time, and (for the Hour Pillar) location. The interpretation text is written from standard Zi Wei Dou Shu reference material; like any astrology system, how you apply it to your life is ultimately a matter of judgment, not a scientific prediction.

How does this compare to what people discuss on Reddit about Zi Wei Dou Shu?

Reddit threads on r/ChineseAstrology and similar communities tend to focus on manually plotting charts using paper templates or older desktop software, then debating interpretation with other practitioners. This calculator automates the plotting step (12 palaces, 14 major stars, minor stars, and the Four Transformations) so you can jump straight to the part Reddit discussions actually care about: what the placements mean. It won't replace a community discussion, but it removes the manual chart-plotting bottleneck that trips up most beginners.

How does this differ from Joey Yap's Zi Wei Dou Shu materials and software?

People searching "zi wei dou shu joey yap" are usually comparing this calculator to Joey Yap's Mastery Academy, a well-known commercial publisher of BaZi and Zi Wei Dou Shu books, courses, and paid software that primarily teaches a specific lineage's interpretive framework. This site is a free, standalone calculator: it generates the same underlying chart structure (palaces, stars, transformations) using open, deterministic calculation logic, with our own plain-English interpretation content. If you've studied Joey Yap's system, you'll recognize the chart layout immediately — the star and palace names used here follow the same traditional terminology.

Is this the same as Master Sean Chan's Zi Wei Dou Shu approach?

Master Sean Chan is a Singapore-based Zi Wei Dou Shu practitioner known for a particular consultation and teaching style. This calculator is not affiliated with any individual master's school or methodology — it presents the standard, widely-used chart structure (the same 12 palaces and 14 major stars taught across most modern lineages) with generalist interpretations, rather than one master's specific technique. If you're looking for a personalized reading in a specific lineage's style, a paid consultation with a named practitioner will go deeper than any calculator.

Free · Deterministic · English & 中文

Zi Wei Dou Shu Calculator

The best free Zi Wei Dou Shu calculator for an accurate, English-language Purple Star Astrology chart. Enter your birth date and time for your 12 palaces, 14 major stars, and Four Transformations — calculated deterministically, explained in plain English.

Year

Month

Day

Birth Hour (Chinese 2-hour block)

Gender

This date is already a lunar calendar date

How This Calculator Works — Algorithm & Method

Source: traditional Zi Wei Dou Shu lunar-calendar star-placement algorithm (via the open-source iztro engine) · Calcul déterministe — aucune IA, aucune estimation arbitraire.

— Chart construction —

solar_date → lunar_date (traditional Chinese calendar conversion)
lunar_date + hour_block + gender → life_palace_position, body_palace_position
life_palace_position → all_12_palaces (fixed clockwise/counter-clockwise order)

— Star placement —

zi_wei_position = f(lunar_day, five_elements_class)
other_13_major_stars = fixed_offset_from(zi_wei_position)

— Four Transformations (四化) —

year_stem → {hua_lu, hua_quan, hua_ke, hua_ji} → attached to 4 specific stars

— algorithm —

lookup(birth_data) → palace_positions → star_positions → transformations → render_chart()

This is the same deterministic calculation method used by professional Zi Wei Dou Shu software — the chart itself is fixed and reproducible; only the interpretation is a matter of reading skill.

Explore Zi Wei Dou Shu

What Is Zi Wei Dou Shu?

A plain-English introduction to Purple Star Astrology.

Chart Interpretation Guide

How to read your chart, step by step.

Stars Meaning

All 14 major stars explained.

The 12 Palaces

Every life domain in your chart.

Love Compatibility

The Spouse (Marriage) Palace explained.

BaZi vs Zi Wei Dou Shu

How the two systems differ.