Chart

What a BaZi chart claims — and what it does not

BaZi is a system for describing a moment in terms of five elements. It makes a narrower claim than its reputation suggests, and the narrower claim is the one a naming decision can actually use.

uion Journal · 23 October 2026 · 6 min read

BaZi — literally “eight characters” — takes the moment of birth and writes it as four pairs of characters. Each pair is a pillar: one heavenly stem on top, one earthly branch below. Year, month, day, hour. Eight characters in total.

The system is about twelve centuries old and has accumulated a great deal of commentary, several schools, and a popular reputation for fortune-telling that its own technical literature mostly does not support. What it actually does is classify. Each stem and branch carries an element — wood, fire, earth, metal or water — and the chart is a map of how those five elements are distributed and how they interact in that particular moment.

The four things a chart tells you

• The four pillars. Year, month, day and hour, each as a stem-and-branch pair.
• The day master. The stem of the day pillar — conventionally read as the self. It is one of the ten stems, and its element is the reference point for everything else.
• Strength. How well supported the day master is by the rest of the chart. A weak day master needs support; a strong one needs an outlet. This is a balance reading, not a verdict on the person.
• The favourable element. Given the balance, which element the chart is short of or which one would resolve a conflict. This is the output that a naming decision uses.

A real chart, read out

Here is the output of the studio's chart endpoint for someone born in Beijing on 3 November 1990 at 10:00 civil time — the same example the chart page casts by default.

Source: the studio's /api/paipan endpoint, queried 23 October 2026.

The reading is coherent without being mystical. The day master is water; water is thin here — one character out of eight — while fire is the heaviest at three. Metal generates water in the standard cycle, which is why the favourable element comes back as metal. A naming decision that wants to work with this chart will look for characters tagged metal.

How a chart becomes a name

This is the only place the chart enters the studio's pipeline, and it enters early rather than as a final adjustment.

1. The chart establishes which element is favourable and which are unfavourable.
2. Characters carrying the favourable element are raised into the candidate pool; characters feeding the unfavourable elements are filtered out.
3. Every surviving candidate is screened against the homophone library and a 1.1-million-name corpus.
4. Names are scored on five dimensions — meaning, pronunciation, naturalness, surname combination, legibility — and every deduction is printed with its reason.

The chart-fit is reported as a separate index and is deliberately kept out of the score. It answers “how well does this name suit this chart”, which is a different question from “how good is this name”. Folding them together would let a chart reading inflate a weak name, or sink a good one.

Hold the name fixed and change only the chart, and only the chart-fit index moves. That is what the separation is for. A name is not good or bad in the abstract; it is good or bad for a chart. Presenting one number would hide exactly the thing the chart is for.

Where the honest limits are

The favourable element is contested. Determining which element a chart needs is the most argued-over step in the whole system, and different schools reach different answers. We use one school and print the reasoning, so a reader who follows another can disagree with a specific step instead of the entire result.

A chart is not a fate. Nothing here predicts anything. The chart describes a balance of five categories at one moment; the naming decision asks which characters sit well with that balance. Neither implies an outcome.

The input can be wrong. A chart is only as good as its birth time. If the recorded minute is off by an hour, or the birthplace is a time zone rather than a longitude, the chart is wrong in a way no amount of interpretation fixes. The solar-time correction removes one class of error and leaves the others alone.

It is one input among several. The chart decides which characters are considered. It does not decide whether the resulting name is pronounceable, whether it collides with an insult, or whether anyone has ever used it. Those checks are separate, and they are the ones that most often reject a candidate.

Related — Giving a Chinese name as a gift