Kua Number Calculation for Numerologists

The Kua number is a single digit drawn from a client's birth year and gender. It comes from the Feng Shui tradition and sits naturally beside a Lo Shu grid reading. This guide shows the traditional formula, the East and West groups, and the mistakes that most often produce a wrong Kua number.

What the Kua number is

In Feng Shui, the Kua number (also written Gua) links a person to one of the eight trigrams and to a set of favourable directions. Its values run from 1 to 9, but 5 is never used as a final result. Instead, a Kua 5 is reassigned, as explained below.

For numerologists, the Kua number adds a spatial layer to the date of birth. The Lo Shu grid tells you which numbers are present or missing. The Kua number tells you which group of directions is traditionally supportive for the client. Together they give you a fuller conversation about home and work spaces.

Step one: use the Chinese solar year

The Kua formula uses the Chinese solar year, not the calendar year. The solar year begins at Li Chun, the start of spring, which falls on or around 4 February.

So a client born in January, or in the first few days of February, counts as born in the previous year. Someone born on 20 January 1981 is treated as born in 1980 for this calculation.

Because the exact start date moves by a day or so, check a solar calendar table for any birth between 3 and 5 February. This is the single most common source of Kua errors.

Note that the solar year is different from the Chinese lunar New Year, which moves between late January and mid-February. Feng Shui calculations traditionally use the solar date. If your school uses the lunar date instead, apply it consistently.

Step two: reduce the last two digits

Take the last two digits of the solar year and add them together. Keep adding until you reach a single digit. Call this number n.

• 1990 → 9 + 0 = 9, so n = 9
• 1987 → 8 + 7 = 15 → 1 + 5 = 6, so n = 6
• 2003 → 0 + 3 = 3, so n = 3

Master numbers play no part here. The Kua calculation always reduces to a single digit.

Step three: apply the formula

The traditional formula differs by gender and by whether the client was born before 2000 or from 2000 onwards.

"Reduced" means adding the digits: 14 becomes 1 + 4 = 5, and 10 becomes 1 + 0 = 1.

For a male born in 2009, n = 9, so 9 − 9 = 0. The rule converts a 0 to 9, giving Kua 9. A male born in 2000 has n = 0, so 9 − 0 = 9 as well.

The Kua 5 rule

If the result is 5, it is replaced. A male Kua 5 becomes 2. A female Kua 5 becomes 8. Always run this check last.

East and West groups

Each Kua number belongs to one of two groups:

In Feng Shui, each group has its own set of traditionally favourable directions. Members of the same group are often said to share supportive directions. The detailed directions for each Kua number vary between Feng Shui schools, so use one reference consistently.

This is where a January birth matters most. Moving a client one year back can change both their Kua number and their group.

Worked examples

Each example below was checked with a short script.

Example 1: Priya Sharma, 15 August 1990, female

Priya's case shows why the Kua 5 rule must come at the end. If you stop at 14 → 5, you report a number that the system does not use.

Example 2: Rohan Kapoor, 20 January 1981, male (a January birth)

If you had used the calendar year 1981, you would get n = 9 and 10 − 9 = 1. That is Kua 1, in the East group. One overlooked rule changes the client's whole set of directions.

Example 3: Ananya Iyer, 9 November 2003, female

For comparison, a male born in the same solar year would have 9 − 3 = 6, which is Kua 6 in the West group.

Using the Kua number with the Lo Shu grid

The Kua number does not replace the Lo Shu reading. It complements it. A useful order in a consultation is:

1. Plot the Lo Shu grid and read the planes, arrows, missing numbers and repeats. Our Lo Shu grid guide covers this in full.
2. Note which elements are weak or absent, using the five-element map.
3. Calculate the Kua number and identify the East or West group.
4. If the client wants space-based suggestions, combine the element picture with the group's directions.

For example, a client with missing Wood numbers (3 and 4) might be offered a small water feature as a supportive suggestion. The Kua group can then guide where in the home that suggestion is placed, according to the Feng Shui school you follow. See our guide to numerology remedies for responsible ways to frame such suggestions.

Keep it practical. Directions and placements should be low-cost, reversible suggestions, never promises of outcomes.

Schools vary, and gender needs sensitivity

There is no single universal Kua method. Some teachers use the full four-digit year in a different calculation. Some use the lunar New Year as the boundary. Some publish slightly different direction tables. All of these can give different results for the same client.

The traditional formula also uses male and female, which may not fit every client. Ask respectfully, explain that the classical formula is gender-based, and let the client decide how they would like it applied. Some practitioners show both results and discuss them together. Whatever you choose, handle the conversation with care and record your choice in the client file.

As with every calculation in this library, the core message is consistency. Choose one convention for the year boundary, the formula and the direction table, then apply it to every client. Our article on common numerology calculation errors explains why mixed conventions cause most chart mistakes.

Key points

• Use the Chinese solar year: births before roughly 4 February count as the previous year.
• Reduce the last two digits of the year to one digit (n).
• Before 2000: male 10 − n, female n + 5. From 2000: male 9 − n (0 becomes 9), female n + 6. Reduce anything over 9.
• Kua 5 becomes 2 for males and 8 for females.
• East group: 1, 3, 4, 9. West group: 2, 6, 7, 8.
• Handle the gender basis of the formula sensitively, and stay consistent.

Frequently asked questions

Why is Kua 5 not used?

In the traditional system, 5 sits at the centre of the Lo Shu square and has no trigram of its own. So a result of 5 is reassigned: to 2 for males and to 8 for females.

What if the client does not know their exact birth date in early February?

Tell the client the Kua number depends on it, and show both possible results. Avoid space-based suggestions until the date is confirmed, because the two results may fall in different groups.

Does the Kua number change over time?

No. It is fixed by the birth year and the formula used. What changes is how you apply it, for example when a client moves home or sets up a new office.

If you calculate many charts a week, software such as the NumberTeller Lo Shu grid tool can apply these rules the same way for every client — but know the method yourself, so you can check any result.

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