Eight Mansions Feng Shui: Your Personal Kua Number

How the Kua Number Is Calculated

The calculation is short enough to do by hand, which is useful because you will want to check a calculator rather than trust it blindly.

1. Take the last two digits of your Chinese birth year and add them together, then reduce to a single digit. So 1985 gives 8 + 5 = 13, then 1 + 3 = 4.
2. Apply the gender rule. For a man born before 2000, subtract that digit from ten. For a man born in 2000 or later, subtract from nine. For a woman born before 2000, add five. For a woman born 2000 or later, add six. Reduce the result to a single digit again.
3. Handle the five. The number five is the centre palace and carries no direction, so it is reassigned — to two for men and to eight for women.

Where the errors happen

Step three is where most online calculators go wrong, along with the Chinese New Year boundary. If you were born in January or early February, you may belong to the previous Chinese year. The eight mansions calculator handles both automatically when you enter a full date.

Worked example

A man born in 1985: 8 + 5 = 13, reduced to 4. Ten minus 4 is 6. So he is a kua 6, West group. A woman born in 1985: 4 plus 5 is 9, so a kua 9, East group. Same birth year, opposite groups — which is exactly why gender appears in the formula.

East Group and West Group

Your kua number places you in one of two groups, and this is the single most useful fact the system produces.

The two groups

East group is one, three, four and nine. West group is two, six, seven and eight. The groups are exact opposites. Every direction that is lucky for the East group is unlucky for the West group, and vice versa — which means that once you know which group you are in, half the directional options are already eliminated, and if you live with a partner from the other group you have a genuine conflict to manage rather than a mistake to correct.

Group and number are different things

This trips people up. A four belongs to the East group but its own element is wood, not one of the two group-defining elements. The group tells you which direction set works for you; the number tells you which trigram you are aligned with, and therefore which of the eight palaces in the bagua belongs to you.

How the groups relate to the bagua

Your kua number corresponds to a trigram, and that trigram's palace is your personal 'gua' — the direction associated with you. A kua 2 lives in the southwest (Kun), a kua 9 in the south (Li), a kua 1 in the north (Kan). The auspicious directions are then derived by rotation from that. The bagua guide explains the underlying trigram map.

Your Four Auspicious Directions

Of the four good directions, two matter most and you should start there.

• Sheng Qi — your success and wealth direction. The strongest of the four. Point your front door toward it and face your desk that way.
• Tian Yi — your health direction. The one to point your bed toward, and the direction that supports recovery and longevity.
• Nian Wei — lasting fortune, a slower and steadier direction associated with long-term projects.
• Pei Wei — personal growth, the direction supporting your individual development and reputation.

What each one does in a house

Sheng Qi is where you want the front door to face, because that is the direction wealth enters from, and where you want your desk. Tian Yi governs health, so it is the direction your head should point when you sleep, and the direction you want the bedroom's most active corner in. Nian Wei supports slow accumulation, which is why it is often applied to a study, a savings arrangement or a long project. Pei Wei is the direction for personal standing and visibility.

Start with two, not eight

Chasing all four produces a house that is technically correct and practically unliveable. Sheng Qi and Tian Yi together are enough to make a measurable difference, and the other two can be layered in later.

Applying the Directions in Your Home

Four applications, in order of how much they matter.

1. The front door

This is the highest-value change and often the hardest. You cannot move a door easily, but you can usually work out the direction it faces, and if it is within 45 degrees of your Sheng Qi, you are already well placed. If it faces close to your bad direction, remedies are more modest: use the Sheng Qi direction for your desk, your main seating, and the place where you receive people.

2. The bed

Point the headboard toward Tian Yi, or failing that toward Sheng Qi. A solid wall behind the headboard is still the priority — the direction matters more than most people expect, but only once the support is right.

3. The desk

Face your working position toward Sheng Qi with your back to a wall. This is the classic 'sit in the command position and face your success direction' arrangement, and it is the change people report noticing first.

4. The living room

Put your main seating in the command position, ideally in the direction of Sheng Qi, and put the reception point — where you sit when guests arrive — facing it. The direction finder helps you convert a bearing into its palace and element.

What if the architecture disagrees

Almost always. Most houses were not designed around the occupant's kua number. Where the door cannot be moved, practitioners work with what is available — facing the desk correctly, orienting the bed, and using colour and light to strengthen the favourable corners. A house that is broadly harmonious in form and generous in light will outperform one that has been 'corrected' by object alone.

Mismatched Households and the Number Five

Two practical problems come up constantly, and both have classical answers.

Couples with opposite group numbers

There are three workable approaches, in order of preference. First, split the function — put each person's bed in their own best direction and let shared rooms use positions that most people tolerate. Second, prioritise the breadwinner, and if only one direction can be optimised, use the Sheng Qi of whoever the household depends on financially. Third, use the centre — the centre of the home is friendly to both groups, so a well-lit, uncluttered middle with a small central feature helps whoever feels least served by the directional choices. Do not try to make one direction good for two incompatible kua numbers by adding a charm; the traditional answer is functional compromise, not decoration.

What the number five means

Five is the centre palace, so it has no direction of its own and is reassigned automatically to two for men and eight for women. This is a rule of the system, not a workaround. Some practitioners also read five as a number of transition and change — suitable for a study, a hallway or a room used for several purposes, and less suitable as a fixed position for a bed or a money corner.

Numbers beyond the kua

The same birth year also gives you a base number and an element number, used for house numbers, phone numbers and floors. The lucky number calculator gives you those, and the lucky number calculator returns both figures.

The Kua Number and the Number Five Explained

Two things confuse people who calculate their kua number for the first time: the reassignment of five, and the difference between the kua number and the base number.

Why five is reassigned

Five is the centre palace in the Lo Shu grid. The centre has no compass direction, so a kua of five cannot be given a directional instruction. Rather than discard it, the system reassigns it: two for men and eight for women. This is a rule of the method rather than a workaround, and a calculator that silently returns five to you is doing something wrong.

Kua number and base number

Your birth year produces more than one number. The base number comes from the last two digits of your Chinese birth year added and reduced, with no gender adjustment. The kua number applies the gender rule on top of that, and it is the kua number that determines your four auspicious directions. The base number is the one used for house numbers, phone numbers and floor numbers.

Which one to use where

Use the kua number for anything about direction: your bed, your desk, your front door, the direction you face when you meditate or work. Use the base number for anything about numbering: your address, your phone number, your floor. Mixing them up is the most common reason people get results that contradict what a book told them to expect.