Every ten years your chart enters a new Da Yun, a luck pillar that changes which of your elements gets support and which gets pressure. The MisterGuan calculator works out your full sequence of Da Yun from your birth details, shows you which cycle you are standing in right now, and explains what that cycle means in plain English. It is free and you do not need an account to see your chart.

What Is a Da Yun?

Da Yun (大运) means "big luck" and it is usually translated as luck pillar or luck cycle. Your birth chart has four pillars that never change. The Da Yun is a fifth pillar that rotates on a ten-year schedule, so a full life passes through a sequence of these cycles, each one carrying its own stem and branch. When practitioners say someone is "in a good ten years" or "walking through a hard decade", the Da Yun is what they are talking about. It does not replace your chart. It sits next to it and shifts the balance, the way weather sits next to a landscape.

How Your Starting Age Is Calculated

This is the part almost nobody can do by hand, and it is the reason "da yun starting age" is such a common search. The traditional method counts the days between your birth moment and the month-opening solar term (Jie) ahead of or behind your birth, depending on your chart's direction, and converts that count into years at a rate of three days per year. That is why one person's cycles begin at age 3 and another's at age 8, and why two people born in the same week can change decades in different years. The calculator does this count from the exact solar term times, so the starting age you see is derived from your actual birth data rather than a rounded guess.

A Worked Example

Take a man born on 18 May 1992 at 6:20 pm local time in Hong Kong (UTC+8). His year pillar is 壬申 (Ren Shen), and 壬 is a yang stem, so his birth year is a yang year. For a yang-year man the luck pillars run forward. Forward means we count ahead to the next month-opening solar term, called a Jie (节). For this birth that is Grain in Ear (芒种, Mang Zhong), which arrives on 5 June 1992 a little after 6 pm Hong Kong time, 18 days after his birth. Dividing by three gives 6, so his first luck pillar begins at age 6. His month pillar is 乙巳 (Yi Si), so his first Da Yun is the next pillar in the sixty-pillar cycle, 丙午 (Bing Wu), followed by 丁未 (Ding Wei) ten years later at age 16, and so on.

Notice what the count skips. Grain Full (小满), another solar term, falls a little over two days after this birth, but it marks the middle of a month rather than its start, so it does not count. Only the twelve Jie that open a new month set the starting age.

Birth moment	18 May 1992, 6:20 pm, Hong Kong (UTC+8). Yang year (壬申), male, so forward
Target Jie	Grain in Ear (芒种), 5 June 1992, a little after 6 pm
Days ÷ 3	18 ÷ 3 = 6
First luck pillar	丙午 from age 6, then 丁未 from age 16

Age here means years after birth, which is how the calculator counts. Chinese almanacs that count a newborn as one year old (虚岁) would write the same hand-over as 7.

Had she been a woman born at the same moment, the pillars would run backward, because a yang year runs backward for a woman. Count back to the Jie that opened her birth month, Start of Summer (立夏, Li Xia) on the afternoon of 5 May 1992, about 13.2 days earlier. That is about 4.39 years. Counted the traditional way (one day = four months, one double-hour = ten days), it reads 4 years, 4 months and about 21 days, which the calculator shows as 4 years, 4 months. Then step backward through the cycle from the month pillar: 甲辰 (Jia Chen) first, then 癸卯 (Gui Mao).

Counting days to the minute is where hand calculations slip, so the calculator does this from the exact solar term times for your own birth.

Calculate my starting age, free →

Why Some Charts Run Forward and Some Run Backward

The sequence of your luck pillars is read off the sixty-pillar cycle starting from your month pillar, and it can run in either direction. Which direction you get depends on the polarity of your birth year combined with your gender, following the classical Zi Ping rule. Forward charts walk into the pillars that come after the birth month; backward charts walk into the pillars that came before it. The direction changes the entire order of your decades, which is another reason a hand calculation goes wrong so easily. The calculator applies the rule for you and lists the cycles in the correct order with the age range for each one.

What Changes When a New Da Yun Begins

A new luck pillar brings a new stem and branch into contact with your chart for roughly ten years. In practice this shifts three things. First, the element balance: a cycle can feed an element your chart is short of, or pile more weight onto one it already has too much of. Second, the relations: the incoming branch can combine or clash with branches in your birth chart, which traditional practice reads as periods where certain life areas ask for more attention. Third, the stage: each cycle also carries one of the twelve life stages, which describes the general texture of the decade. None of this is a prediction of events. A Da Yun is read as an indication of conditions, like knowing the season you are planting in.

How to Read Your Own Luck Pillars

When you cast your free chart, the preview shows your full Da Yun sequence as a list of decades with the pillar, the stage, and your age range for each, and your current decade is highlighted. Start there. Knowing which cycle you are in today, and when the next one begins, is the single most useful piece of timing information in a BaZi chart. From the chart page you can go deeper into what the current cycle supports for you specifically.

If you want the foundations first, read What is BaZi and How the month pillar is calculated, because your Da Yun sequence is built from your month pillar. Your core personality read lives in the free BaZi personality analysis.