Numerology basics

What is numerology? The numbers from your birth date and name

By Inti Foundation · updated 20 October 2026

Numerology turns your birth date and full name into a few core numbers — the Life Path (called “số chủ đạo” in Vietnam), Expression, Soul Urge and Personality — and reads them as a language for observing your own tendencies and rhythm of growth, not as a prediction. The birth date gives the numbers about life's rhythm, such as the Life Path, the personal year, four pinnacles and four challenges; the name is stripped of accents and each letter becomes a number from 1 to 9 on the Pythagorean table, giving the numbers about how you express yourself. Inti Soul calculates all of them with a deterministic engine: the same name and birth date always give the same set.

Try it now: Numerology lookup and Life Path calculator

Birth date

Life Path, Birthday, Attitude, personal year, four pinnacles and four challenges.

Full name

Expression from every letter, Soul Urge from the vowels, Personality from the consonants.

Read to know yourself

Each number is a question to observe, not a verdict on the future.

Which numbers numerology calculates

From your Gregorian birth date and full name, Inti Soul's numerology engine calculates these numbers, each with a published formula:

Life Path (“số chủ đạo”): reduce the birth month, day and year separately, add the three results, then reduce again.
Birthday number: the day alone, reduced — the 15th gives 1 + 5 = 6.
Attitude number: the reduced month and day added together, then reduced.
Personal year: the birth month and day plus the year in question, reduced — it changes every year.
Four pinnacles and four challenges: four stages of life; the first ends at age 36 minus the Life Path (master numbers 11, 22, 33 count as 2, 4, 6), and the two middle stages last 9 years each.
Expression (every letter of the name), Soul Urge (only the vowels A, E, I, O, U) and Personality (only the consonants).
Maturity: Life Path plus Expression, reduced; Karmic Lessons: the numbers from 1 to 9 missing from the name.

The Pythagorean letter table for names

The name is stripped of accents first — Đ becomes D, Ư becomes U, Ơ becomes O — then each letter takes a number from the nine-letter cycle of the Pythagorean table:

1: A, J, S
2: B, K, T
3: C, L, U
4: D, M, V
5: E, N, W
6: F, O, X
7: G, P, Y
8: H, Q, Z
9: I, R

Example: born 15/05/1990, named Đức Anh

A sample birth date and name, calculated by the app's own numerology engine:

Life Path: month 5; day 15 becomes 1 + 5 = 6; year 1990 becomes 1 + 9 + 9 + 0 = 19, then 1 + 9 = 10, then 1. Adding the three parts: 5 + 6 + 1 = 12, which reduces to 3.
Birthday 6; Attitude 5 + 6 = 11, kept because it is a master number; personal year 2026 is 3.
Four pinnacles 11, 7, 9, 6 for the age stages 0–33, 34–42, 43–51 and from 52; four challenges 1, 5, 4, 4.
The name Đức Anh without accents is D, U, C, A, N, H: 4 + 3 + 3 + 1 + 5 + 8 = 24, which reduces to Expression 6.
Vowels U, A: 3 + 1 = 4 is the Soul Urge; consonants D, C, N, H: 4 + 3 + 5 + 8 = 20, which reduces to Personality 2.
Maturity: Life Path 3 plus Expression 6 makes 9.

Master numbers 11, 22, 33 and karmic debt

Two conventions decide the final number. Inti Soul keeps 11, 22 and 33 instead of reducing them further, so the Life Path is always one of the twelve numbers 1 to 9, 11, 22, 33 — there is no 10. When the total just before the Life Path's last reduction is 13, 14, 16 or 19, the reading adds a karmic debt note: a birth date of 03/01/1980 gives the total 1 + 3 + 9 = 13, and the Life Path shown is still 4. Sites using other conventions can give a different number for the same birth date.

Read a number as a question, not a label

A number does not say who you are or what will happen; two people with the same Life Path still have different names, circumstances and choices. Hold one number for a few days as a rhythm to observe — where it fits the way you live and where it does not — rather than treating it as a reason to give up responsibility or to believe life is already decided.

Looking up numerology on Inti Soul

The Numerology lookup page calculates right on the page: a birth date gives the Life Path, Birthday and Attitude numbers, four pinnacles and challenges; add your full name for Expression, Soul Urge and Personality. Results are deterministic, use no AI and are not written to the database. Write down one point that fits and one that does not, then return after 24 hours; view paid plans only if the need still repeats. The tool is for adults aged 18 and over.

Get your free numerology reading

A free Inti Soul account gives you one overview numerology reading about yourself, written from your name and birth date — once, for life; topic-by-topic readings are part of Premium.

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For self-understanding and reflection — not a verdict.

Frequently asked questions

Does numerology need a birth time?

No. Numerology uses only the Gregorian birth date and the full name; a birth time is needed for other systems such as Zi Wei, Bazi or a birth chart.

How many Life Path numbers are there?

On Inti Soul there are twelve: the numbers 1 to 9 and the three master numbers 11, 22, 33. A total of 10 reduces to 1, so there is no Life Path 10.

Is numerology accurate?

The calculation is exact to its formula: the same name and birth date always give the same set of numbers. What each number means is a symbolic language for self-reflection, not a scientific prediction or a verdict on the future.

Does changing my name change the numbers?

Only the numbers calculated from the name — Expression, Soul Urge, Personality and Maturity — change with the name used; the Life Path and the birth-date numbers stay the same.

What can I read for free about numerology on Inti Soul?

Every number in the section above is calculated for free on the Numerology lookup page, without an account. A free Inti Soul account gives you one overview numerology reading about yourself, written from your name and birth date — once, for life; topic-by-topic readings are part of Premium.