Basics
Pythagorean numerology explained
Updated
Pythagorean numerology: how the API works it out
The letters run in rows of nine. A is 1, B is 2 and so on up to I, which is 9. J starts again at 1, and so does S.
So R is 9 and Z is 8. The API uses these values for two jobs. First, every Western number on POST /v1/western is Pythagorean only.
That covers the life path, expression, soul urge and personality numbers and the rest of the Western set. The response says so in system, and basis states each method where books differ. Master numbers 11, 22 and 33 are kept there, with the single digit beside them in digit.
Second, the Indian name number comes back in both systems. POST /v1/profile returns name_number.pythagorean next to the Chaldean block, with read set to false. It holds numbers only, with no reading.
POST /v1/name gives each spelling a Pythagorean total and number in the same way. Your users can compare a result from another book without the two systems getting mixed. For John Doe, John gives 20 and Doe gives 15, a total of 35.
So his Pythagorean name number is 8, while his Chaldean one is 7. On the Western route, each word is reduced first: 20 becomes 2 and 15 becomes 6. Their sum also gives 8, which is his expression number.
The Pythagorean letter values, 1 to 9 in alphabet order, match the table in L. Dow Balliett's The Philosophy of Numbers (1908).
Get it from the API
POST /v1/western
# John Doe, born Aug 15, 1990
curl -X POST "https://apiforastrology.com/api/numerology/v1/western?as_of=2026-10-01" \
-H "Authorization: Bearer $ASTROLOGY_API_KEY" \
-H "Content-Type: application/json" \
-d '{"name":"John Doe","birth_date":"1990-08-15"}'{
"input": {
"name": "John Doe",
"birth_date": "1990-08-15"
},
"system": "pythagorean",
"about": "These are the Western numbers. They use the Pythagorean letter values, where A is 1, B is 2 and so on. The numbers 11, 22 and 33 are master numbers and are…",
"basis": {
"letters": "Pythagorean letter values (A=1 ... I=9, J=1 ...).",
"masters": "11, 22 and 33 are kept; `digit` is the same number reduced to 1-9.",
"life_path": "Month, day and year are reduced one by one, then added.",
"name_numbers": "Each word is reduced, then the words are added.",
"y": "Y counts as a vowel when neither letter beside it is a vowel.",
"personal_year": "Counted on the calendar year, from January 1.",
"pinnacles": "The first ends at age 36 minus the life path digit; each later one lasts nine years, and the fourth for life.",
"life_cycles": "Month, day and year, each reduced (masters kept). The first cycle ends with the first pinnacle, the second 27 years later, and the third runs for life.",
"karmic_debt": "Karmic debt is looked for in six numbers: life path, expression, soul urge, personality, maturity and birthday. Pinnacles, challenges and life cycles are not…"
},
"life_path": {
"total": 15,
"number": 6,
"digit": 6,
"karmic_debt": [],
"parts": {
"month": 8,
"day": 6,
"year": 1
},
"about": "Your life path number comes from your full birth date. It shows the main road your life tends to follow.",
"reading": "Your road tends to center on caring for others. Family, home and community often matter most to you."
},
"expression": {
"total": 8,
"number": 8,
"digit": 8,
"karmic_debt": [],
"words": [
20,
15
],
"about": "Your expression number comes from every letter of your full name. It shows your natural talents.",
"reading": "You have a natural gift for business, managing and handling money."
},
"soul_urge": {
"total": 17,
"number": 8,
"digit": 8,
"karmic_debt": [],
"words": [
6,
11
],
"about": "Your soul urge number comes from the vowels in your name. It shows what you want deep inside.",
"reading": "Deep inside, you want success and to be respected for what you achieve."
},
"personality": {
"total": 9,
"number": 9,
"digit": 9,
"karmic_debt": [
{
"number": 14,
"reading": "14 points to a lesson about balance. Too much of anything, from food to freedom, tends to cost you."
}
],
"words": [
14,
4
],
"about": "Your personality number comes from the consonants in your name. It shows how people see you before they know you well.",
"reading": "People tend to see you as open-hearted and generous."
},
"maturity": {
"total": 14,
"number": 5,
"digit": 5,
"karmic_debt": [
{
"number": 14,
"reading": "14 points to a lesson about balance. Too much of anything, from food to freedom, tends to cost you."
}
],
"about": "Your maturity number adds your life path and expression numbers. It shows what tends to grow stronger after about age 35.",
"reading": "After about age 35, you tend to want more freedom and change. New places, people and ideas often keep you growing."
},
"birthday": {
"day": 15,
"number": 6,
"digit": 6,
"karmic_debt": [],
"about": "Your birthday number is the day of the month you were born. It shows one special gift you carry.",
"reading": "You tend to have a special gift for caring for others. You may be good at looking after people and making any place feel like home."
},
"karmic_lessons": {
"about": "Karmic lessons are the numbers from 1 to 9 that no letter of your name gives. They show skills you may need to build on purpose.",
"numbers": [
{
"number": 2,
"reading": "No letter gives 2. Patience and working closely with others may need practice."
},
{
"number": 3,
"reading": "No letter gives 3. Sharing your feelings and ideas out loud may need practice."
}
]
},
"hidden_passion": {
"numbers": [
5,
6
],
"count": 2,
"about": "Your hidden passion is the number that appears most often in the letters of your name. It shows a strong drive you may not talk about.",
"readings": [
"5 is about freedom, change, travel and trying new things.",
"6 is about care, family, home and taking responsibility."
]
},
"balance": {
"initials": "JD",
"total": 5,
"number": 5,
"about": "Your balance number comes from the first letter of each part of your name. It shows how you tend to handle hard times.",
"reading": "5 is about freedom, change, travel and trying new things."
},
"challenges": {
"about": "Your four challenge numbers come from your birth date. Each shows something you may have to work at during part of your life.",
"items": [
{
"id": "first",
"number": 2,
"name": "First challenge",
"reading": "Not taking things too personally."
},
{
"id": "second",
"number": 5,
"name": "Second challenge",
"reading": "Handling freedom wisely and not rushing from one thing to the next."
}
]
},
"pinnacles": {
"about": "Your four pinnacles are long stretches of your life. Each one has its own number and its own focus.",
"as_of": "2026-10-01",
"items": [
{
"id": 1,
"number": 5,
"digit": 5,
"from_age": 0,
"to_age": 30,
"from_year": 1990,
"to_year": 2020,
"current": false,
"reading": "5 is about freedom, change, travel and trying new things."
},
{
"id": 2,
"number": 7,
"digit": 7,
"from_age": 31,
"to_age": 39,
"from_year": 2021,
"to_year": 2029,
"current": true,
"reading": "7 is about study, thinking deeply and looking inward."
}
]
},
"life_cycles": {
"about": "Your life cycles are three long stages of your life: your early, middle and later years. Each stage has its own number and its own mood.",
"as_of": "2026-10-01",
"items": [
{
"id": "early",
"number": 8,
"digit": 8,
"from_age": 0,
"to_age": 30,
"from_year": 1990,
"to_year": 2020,
"current": false,
"name": "Early years",
"reading": "8 is about ambition, money, managing people and real results."
},
{
"id": "middle",
"number": 6,
"digit": 6,
"from_age": 31,
"to_age": 57,
"from_year": 2021,
"to_year": 2047,
"current": true,
"name": "Middle years",
"reading": "6 is about care, family, home and taking responsibility."
}
]
},
"personal": {
"as_of": "2026-10-01",
"year": {
"number": 6,
"about": "Your personal year number shows the theme of this year for you. It changes on January 1.",
"reading": "A year for home, family and duties. People may lean on you.",
"do": "Give time to your home and family. Help the people who lean on you, and plan what you can do for them. Fix or improve something at home. Spend time with your…",
"avoid": "Avoid taking on every duty yourself. Try not to give advice or help where it is not wanted. Do not forget your own rest while you care for others. Avoid…"
},
"month": {
"number": 7,
"about": "Your personal month number shows the theme of this month for you.",
"reading": "This month tends to favor rest, study and thinking things over. You may want more quiet time than usual. It is a good time to read, plan and look inward,…"
},
"day": {
"number": 8,
"about": "Your personal day number shows the theme of this day for you.",
"reading": "Good for work, money and big decisions."
}
},
"not_computed": [],
"not_claimed_karmic": "Karmic debt and karmic lessons describe patterns to work on. They are not a claim about a past life.",
"not_claimed": "Numbers describe tendencies, not fixed events. Use them as a guide, not a rule.",
"localization": {
"lang": "en",
"detail": "standard",
"fell_back_to_en": [],
"fell_back_to_standard": []
}
}Where the API returns it
| POST | /v1/western | Western numbers |
| POST | /v1/name | Name checker |
| POST | /v1/profile | Core numbers and Lo Shu grid |
Feature page: Western numbers. Try it free: Name numerology calculator. Both systems compared: Chaldean vs Pythagorean numerology. The rules the API follows are on the conventions page.
Related terms
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Numerology API
Get these numbers from the API
Create a free test key and call any route on this page with the sample people. Or try a request in the API reference first.
Your first answer
John Doe, born Aug 15, 1990
- Mulank6Venus
- Bhagyank6Destiny number
- Name number7Ketu
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