Chaldean vs Pythagorean Numerology: Key Differences

Chaldean and Pythagorean numerology differ mainly in how they turn letters into numbers: Pythagorean numbers the alphabet 1 to 9 in order, while Chaldean gives letters values from 1 to 8 by sound and leaves 9 unassigned. They also read totals differently, with Chaldean keeping the two-digit compound and Pythagorean keeping the master numbers 11, 22 and 33, so the same name often gives two different numbers, and neither answer is wrong.

The differences at a glance

The two letter charts

Chaldean:

Pythagorean:

Ten letters carry the same value in both charts: A, J, B, K, C, L, D, M, E and N. The other sixteen differ, which is why the two systems so rarely agree.

Where each system comes from

Both names point further back than the methods themselves.

Pythagorean numerology is named after Pythagoras, the Greek philosopher of the sixth century BCE who taught that number underlies everything. There is no evidence that he used this letter chart. The modern method took shape in the early twentieth century, notably through the American writer L. Dow Balliett, and it now gives Western numerology its core numbers.

Chaldean numerology takes its name from the Chaldeans, the star-watchers of ancient Babylon. The letter table in use today, though, was set out in the early twentieth century by writers such as Cheiro, the palmist and numerologist whose Book of Numbers (1926) made it famous. Cheiro’s books have been widely read in India for a century, and Indian numerology, or Ank Jyotish, adopted his chart and linked each number with one of the nine grahas.

One name, two answers

Here is the name Pooja Singh in both systems:

Pythagorean. Pooja adds to 21, which reduces to 3, and Singh to 30, which also reduces to 3. Adding the two gives a Destiny number of 6. Western numerology reduces each name on its own like this, so that a master number is neither created nor hidden by accident.

Chaldean. All the letters together add to 41: Pooja 24 and Singh 17. The compound 41 reduces to 5. In Cheiro’s table 41 shares its meaning with 32, a fortunate number of success with people and groups. Indian numerology would then compare the 5, ruled by Mercury, with Pooja’s Moolank and Bhagyank.

So the same name is a 6 in one system and a 5 in the other. Single first names show the same pattern:

For these five names the two systems never agree. That is normal, and it is the clearest reason to know which chart a reading uses.

Master numbers and compound numbers

The two systems also treat two-digit totals in opposite ways.

Pythagorean numerology reduces almost everything to one digit, but keeps three totals as master numbers: 11, 22 and 33, read as carrying a larger version of their root numbers 2, 4 and 6. Asha’s 11 above is one of them.

Chaldean numerology, as Cheiro taught it, reads every total from 10 to 52 as a compound number with its own meaning, and only then reduces it to a single digit. A total above 52 is read by taking away 9 until it falls inside his table. Cheiro gave his compounds a tone: some fortunate, such as 19 and 23, some mixed, and some cautionary, such as 16 and 18.

The same total can therefore mean quite different things. In Pythagorean numerology 11 is the Illuminator; in Cheiro’s table it is a cautionary compound. That is not a contradiction to resolve. A number’s meaning belongs to its system, and mixing the two only creates confusion.

Which name, and which numbers

The two traditions even read the date of birth differently. Pythagorean numerology centres on the Life Path, the whole date reduced to one digit or a master number. Cheiro gave special weight to the day of the month, his “psychic number”, and read the whole date as a “destiny number”; Indian numerology calls these the Moolank and the Bhagyank, and always reduces them to a single digit from 1 to 9.

Each system also starts from a different name:

• Pythagorean uses your full name as it was given at birth for the Destiny number, its vowels for the Soul Urge and its consonants for the Personality number. Your date of birth gives the Life Path.
• Chaldean, in Cheiro’s view, works through the name you are known by, because a name acts through use. Indian practice compares that name number with your Moolank and Bhagyank, from your date of birth, through the friendship of their ruling planets.

That is why Indian name correction, which adjusts the spelling of the name you use every day, is done with the Chaldean chart. Our guide to name numerology and name correction shows how it works.

Why calculators disagree

If two apps give you different name numbers, check these in order:

1. The chart. Chaldean and Pythagorean values differ for most letters.
2. The method of adding. Reducing each name separately can give a different result from adding the whole name at once.
3. Master numbers. Some calculators keep 11, 22 and 33; others reduce them.
4. The letter Y. In Pythagorean vowel counts, Y may count as a vowel or a consonant depending on its neighbours.
5. The name itself. Birth name or everyday name, initials, a married name, or a different English spelling, such as Puja for Pooja.

Once these match, the two calculators should agree.

Spelling deserves a special word, because Indian names have more than one English form. Lakshmi adds to 19 in the Chaldean chart and reduces to 1, while Laxmi adds to 14 and reduces to 5; in the Pythagorean chart the two spellings give 1 and 5 as well. Both systems respond to the letters you actually write, which is exactly why Indian name correction works by adjusting a spelling. Use the form you sign with and that people see every day.

Which should you use?

Use the system that fits your question, and stay with it:

• For checking or correcting a name against your birth numbers, as Indian numerologists do, use the Chaldean chart.
• For a Western-style profile of your Life Path, Destiny, Soul Urge and Personality, use the Pythagorean chart.
• Avoid shopping for answers. Running your name through every system until one gives a number you like defeats the purpose of either.

Neither system can predict events, and no number is lucky or unlucky for everyone. Both are symbolic languages for reflecting on a name and a date of birth.

Our Numerology tool uses each system where it belongs. Your life path number is free, and the full report gives your Destiny, Soul Urge and Personality numbers on the Pythagorean chart, your Chaldean name number with Cheiro’s reading of its compound, and a letter-by-letter table showing both values side by side. For more on the date-based numbers, see the life path number guide and our guide to Moolank and Bhagyank.