BaZi Chart Calculator
A BaZi chart (Four Pillars / 生辰八字) converts your birth year, month, day and hour into four heavenly-stem / earthly-branch pairs. Enter a solar birth date and the engine deterministically computes the Year, Month and Day pillars from the solar terms, with the Day Master highlighted.
What the result shows
After you enter a solar birth date, the result page lists the engine-computed facts below.
Pillars & Ten Gods
Year, Month and Day pillars with each pillar's ten god; the Hour pillar once a birth time is added.
Hidden Stems & Life Stages
Each branch's hidden stems with their ten gods, and the Day Master's life stage in every branch.
Nayin & Void
The Nayin of each pillar, and the void branches.
Lunar Date & Solar Terms
The matching lunar date, Chinese zodiac, sun sign, and the position between solar terms.
Interactions
Combinations, clashes, punishments and harms detected among the three pillars.
Shen Sha
The stars found on the three pillars, with their classical auspice category.
How it's computed
The chart is cast by a deterministic engine, not generated by a model — the same input always yields the same result.
Enter a date
Just the solar year, month and day — three pillars first if the hour is uncertain.
Solar-term computation
Year and Month pillars are bounded by the solar terms (立春 and the 节令), the Day pillar follows the continuous sexagenary day count — never the lunar month.
See the details
Ten gods, hidden stems, Nayin, Shen Sha, the lunar date and solar terms — itemized so you can check each one.
Casting is a deterministic computation with no AI involved — one input, one chart, always.
The same chart, read other ways
Frequently asked questions
What information does the chart need?
A solar birth date is enough for the Year, Month and Day pillars; add the birth hour for the full four. Gender is needed only for the luck cycles, inside the app.
Can I compute a chart without my birth time?
Yes — the three pillars come from the date alone. The Hour pillar, and the strength, pattern, useful god and luck cycles that depend on the full four, follow once you add a birth time in the app.
Do I enter a solar or a lunar date?
Enter the solar (Gregorian) date; the result page also shows the matching lunar date and its stems and branches.
How is the chart computed — could it be wrong?
A deterministic engine computes it from the solar-term boundaries — the same input always yields the same result, and it can be recomputed and checked. No AI is involved in this step.
Is the chart free?
The chart is free. Deep readings written from it (such as the Life Report) are paid products — entirely your call.
Cast your full chart, free
Want the full chart (Hour pillar, luck cycles, useful god & pattern) with a personalized reading? Add your birth time.