In the Eight Mansions formula, every person has a Kua number. This is determined by your date of birth.

How do you calculate your own Kua number?

Please note that the Chinese Solar calendar is from 4^{th} February to 3^{rd} February of the following year.

**Calculation of Kua numbers for birth years up to 1999 (with examples):**

For Men (born up to 1999)

**Example 1**

Date of birth: March 1969

Add the last 2 digits of your birth year until it is a single digit. Subtract this number from 10. The result is your Kua number.

Example: your birth year- March 1969.

Add the last 2 digits of your birth year – 6 + 9 = 15.

Then add the 2 digits – 1 + 5 = 6

Subtract this number from 10. 10 – 6 = 4

Your Kua number is 4.

**Example 2**:

Date of Birth: Jan 1969

Because you are born before 4th Feb 1969, your Chinese birth year is 1968

Add the last 2 digits of your birth year until a single digit.

Add the last 2 digits if your birth year – 6 + 8 = 14

Add the 2 digits again – 1 + 4 = 5

Subtract from 10 – 10 – 5 = 5

Your Kua number is 5

For Women (born up to 1999)

**Example 3:**

Date of birth: March 1969

Add the last 2 digits of your birth year until it is a single digit. Add this number to 5. The result is your Kua number.

Add the last 2 digits of your birth year – 6 + 9 = 15

Then add these 2 digits – 1 + 5 + 6

Add 5 to the result – 5 + 6 = 11

If there are 2 digits, add the 2 digits – 1 + 1 = 2

Your Kua number is 2

**Example 4:**

Your date of birth is Jan 1969

Because you are born before 4th Feb 1969, your Chinese birth year is 1968

Add the last 2 digits of your birth year until a single digit.

Add the last 2 digits if your birth year – 6 + 8 = 14

Add the 2 digits again – 1 + 4 = 5

Add 5 to the result – 5 + 5 = 10

If there are 2 digits, add the 2 digits – 1 + 0 = 1

Your Kua number is 1

Calculation of Kua numbers for birth years after 2000:

**Male:**

Your date of year is April 2011

Add the last 2 digits – 1 + 1 = 2

Subtract from 9 – 9 – 2 = 7

Your Kua number is 7

**Female:**

Your date of birth is April 2011

Add the last 2 digits – 1 + 1 = 2

Add 6 to the above number 6 + 2 = 8

The table below is a listing of the birth years between 1982 to 1990

Year | Kua Number | |

After 4^{th} February | Male | Female |

1982 | 9 | 6 |

1983 | 8 | 7 |

1984 | 7 | 8 |

1985 | 6 | 9 |

1986 | 5 (2) | 1 |

1987 | 4 | 2 (8) |

1988 | 3 | 3 |

1989 | 2 | 4 |

1990 | 1 | 5 |

1991 | 9 | 6 |

In the Male column, the Kua 5 has 2 in brackets or parenthesis. This means that the male of Kua 5 takes on the properties of Kua 2.

In the Female column, the Kua 5 has 8 in brackets or parenthesis. This means that the female of Kua 5 takes on the properties of Kua 8.

The gender of men and women refer to the gender at the time of birth.

For other dates not listed above, refer to this link where there is an automated Kua number system.

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