BaZi (八字, "eight characters") is the Chinese practice of reading a birth chart made of four pillars: the year, month, day and hour of birth. Each pillar is a pair of characters, a heavenly stem above an earthly branch, which gives eight in all, and the stem of the day pillar, called the Day Master, stands for you.
That's why it's also called the Four Pillars of Destiny. It's to the Chinese zodiac roughly what a full birth chart is to a Western Sun sign: the year animal everyone knows is just one of the eight characters.
The four pillars
| Pillar | Taken from | Traditionally linked with |
|---|---|---|
| Year | The solar year, starting at Lichun | Ancestry and early life |
| Month | The solar month, starting at a solar term | Parents, upbringing, the foundations of work |
| Day | The unbroken sixty-day count | Yourself and your spouse |
| Hour | The two-hour period of birth | Children, later life, the inner self |
Two details catch newcomers out. BaZi's year begins at Lichun, the Start of Spring, on February 3, 4 or 5, not at Chinese New Year; and its months are solar months, each starting when the Sun reaches a particular point, not lunar months. Our guide to what your Chinese zodiac sign is shows how the two year boundaries can give different animals for an early-February birthday.
Stems and branches
The ten heavenly stems are the five elements, each in a yang and a yin form:
- Wood: Jia 甲 (yang), Yi 乙 (yin)
- Fire: Bing 丙 (yang), Ding 丁 (yin)
- Earth: Wu 戊 (yang), Ji 己 (yin)
- Metal: Geng 庚 (yang), Xin 辛 (yin)
- Water: Ren 壬 (yang), Gui 癸 (yin)
The twelve earthly branches are the zodiac animals, each with an element of its own: the Rat is Water, the Horse Fire, the Tiger Wood, and so on. Stems and branches pair up in a sixty-step cycle, the same cycle that names the years. The Chinese zodiac elements guide explains the cycle and how the elements feed and check each other, which is the grammar of every BaZi reading.
A worked example
Take an invented birth: 4:00 am on June 28, 1990, by local solar time, so no clock corrections are needed.
- Year. The birth comes after Lichun 1990 (February 4), so the year pillar is Geng Wu: yang Metal over the Horse.
- Month. The Horse month began at the solar term Grain in Ear on June 6, 1990, and ran until July 7. In a Geng year the months' stems follow a fixed sequence, and the Horse month's stem is Ren, so the month pillar is Ren Wu: yang Water over the Horse.
- Day. Days have their own stem and branch in a sixty-day cycle that has run without a break for well over two thousand years. June 28, 1990 happens to be Jia Zi, the first day of the cycle: yang Wood over the Rat. Practitioners look this up in a printed almanac or software.
- Hour. 4 am falls in the Tiger hour, 3 am to 5 am. On a Jia day, the hours' stems start from Jia at the Rat hour, which makes the Tiger hour Bing Yin: yang Fire over the Tiger. The full list of hours is in our guide to the Chinese zodiac birth hour.
Written the traditional way, with the year on the right:
| Hour | Day | Month | Year | |
|---|---|---|---|---|
| Stem | Bing (Fire) | Jia (Wood) | Ren (Water) | Geng (Metal) |
| Branch | Tiger (Wood) | Rat (Water) | Horse (Fire) | Horse (Fire) |
This person's Day Master is Jia, yang Wood, often pictured as a tall tree. Their zodiac animal, the Metal Horse, is just the year column.
The Day Master and the balance of elements
A reader starts from the Day Master and asks how the rest of the chart treats it. Our example chart has three Fire characters, two Water, two Wood, one Metal and no visible Earth, and it belongs to a tree born in high summer. A practitioner would usually describe that tree as surrounded by Fire, which Wood feeds, so the Water in the month stem and the day branch matters, because Water nourishes Wood. Earth, the element Wood controls, doesn't appear among the eight visible characters, though the Horse branch is said to hold some Earth hidden inside it.
From that balance a reader judges whether the Day Master is strong or weak and which element would steady it. They also use the Ten Gods, names for each character's relationship to the Day Master: Water, which feeds Wood, is this chart's Resource, and Metal, which controls Wood, its Officer. It's an intricate system, and two experienced readers can weigh the same chart differently.
Luck pillars and the years ahead
A chart doesn't stand still. BaZi lays out ten-year luck pillars, derived from the month pillar, that run forward or backward through the cycle depending on your gender and whether your birth year is yang or yin. Each calendar year also has its own pillar, and readers look at how it meets yours: 2027, for example, is Ding Wei, yin Fire over the Goat, covered in our Year of the Goat 2027 guide. Treat these as themes for reflection rather than forecasts.
Where BaZi comes from
Tradition credits the Tang dynasty scholar Li Xuzhong with a method using three pillars, year, month and day. In the Song dynasty, Xu Ziping added the hour, giving four pillars and eight characters, and the approach is still called the Ziping method after him. The Song text Yuanhai Ziping remains a foundational manual. BaZi was used at the imperial court in the Ming and Qing dynasties, and spread to Korea, where it's called saju and is often consulted before marriage, and to Japan.
Families also used it for matchmaking, naming children and choosing dates. Feng shui borrows the same calendar; the Kua number, for instance, also uses the solar year from Lichun.
BaZi isn't a science, and no controlled test has shown it predicts character or events. It's a sophisticated, centuries-old language for talking about time and temperament, and many people find a reading a useful prompt for reflection.
Questions readers ask
Is BaZi the same as the Chinese zodiac?
No. The zodiac animal is the branch of your year pillar, one character out of eight. BaZi uses all four pillars, their stems and elements, and the relationships between them. The Chinese zodiac vs Western zodiac guide puts both in context.
Do I need my exact birth time for BaZi?
For the full chart, yes, because the hour pillar changes every two hours. Without it, a reader can still work with the year, month and day, which is six characters out of eight. Births close to an hour boundary, or near midnight, may need a reader's judgment about solar time.
Can I work out my BaZi chart by hand?
The year and month you can, with a list of solar term dates and the stem rules. The day pillar needs a sixty-day calendar, which is why almanacs and software exist. If you know Western charts, our guide on how to read a birth chart shows the equivalent steps there.
Is BaZi accurate?
There is no scientific evidence that BaZi predicts personality or events. Practitioners and clients value it as a structured way of thinking about strengths, timing and choices, and it's best used that way.
