A system with an old name
Chaldean numerology is one of the two letter tables used in modern numerology, which is a belief practice and has no demonstrated predictive power. The other is the Pythagorean table. The word “Chaldean” is meant to suggest great age, and it is worth looking at what that name does and does not mean.
In the ancient Mediterranean world, “Chaldean” was often used for astrologers and astronomers associated with Babylon. Greek and Roman writers regularly spoke of Chaldeans as experts in the stars. Proponents of the numerology that carries the name claim that it descends from that Babylonian learning, and sometimes add that it passed through Hebrew or Indian hands on the way.
Why the claimed origin is doubtful
No ancient Chaldean letter table survives. This is not just a gap in the record; there is a basic problem with the idea. Babylonian scholars wrote in cuneiform, a script made of signs for syllables and words, not an alphabet in which each letter could be given a number. Older letter-number traditions, such as Milesian numerals in Greek and abjad numerals in Arabic, really were alphabetic from the start. The modern Chaldean table assigns numbers to the letters of the Latin alphabet, which did not exist in the form we know it until long after Babylon’s scholarly tradition had faded.
What the evidence does show is that Babylonian astronomers were serious observers, and that the Mesopotamian sexagesimal system they used, counting in sixties, shaped later habits such as the sixty-minute hour. That is a different matter from a table matching letters to digits. The Chaldean table as we know it appears in English-language writing of the early twentieth century, and authors such as the palmist who wrote as Cheiro are often associated with spreading it. Where those authors got it is not documented in a way a historian can check, so the safest description is “a modern table with a claimed ancient pedigree”.
The table
In the commonly published form, the letters are assigned as follows:
| Number | Letters |
|---|---|
| 1 | A, I, J, Q, Y |
| 2 | B, K, R |
| 3 | C, G, L, S |
| 4 | D, M, T |
| 5 | E, H, N, X |
| 6 | U, V, W |
| 7 | O, Z |
| 8 | F, P |
The digit 9 is not assigned to any letter. Writers who use the system usually explain this by calling nine sacred or special in some way and keeping it apart from ordinary letters. That is a claim of the tradition, not a finding, and some printed versions of the table differ in small details, which is another reason to treat it as a convention.
Notice also that the grouping is not alphabetical. Letters are scattered, and the reason for the arrangement is not explained in any source that can be dated to antiquity. Some authors link it to the sounds of letters, though the explanations given vary from book to book.
How it differs from the Pythagorean table
The Pythagorean table is the easier one to remember. It runs through the alphabet in order, giving A to I the digits 1 to 9, then starting again at 1 for J. Chaldean numerology jumbles the letters and stops at 8.
The practical difference is that the two tables often give different totals for the same word. Take “CAT”:
- Chaldean: C = 3, A = 1, T = 4, so 3 + 1 + 4 = 8.
- Pythagorean: C = 3, A = 1, T = 2, so 3 + 1 + 2 = 6.
Take “SUN”:
- Chaldean: S = 3, U = 6, N = 5, giving 14, which reduces to 1 + 4 = 5.
- Pythagorean: S = 1, U = 3, N = 5, giving 9.
If the digit assigned to a name changes depending on the table, then whatever meaning is read from it is also changing. Users sometimes treat this as a feature, saying one system suits one purpose better, but it also shows that nothing external fixes the result. The numbers come from conventions, and the meanings attached to them come from books.
Other differences in practice
Chaldean practitioners often care about the total before reduction as well as after it, so a compound number such as 14 is read separately from the single digit 5 it reduces to. Pythagorean-style books usually concentrate on the single digit, with some attention to master numbers such as 11. This contrast is a matter of authors’ habits rather than anything fixed by the tables themselves.
The two schemes also often differ in which part of a person’s name is counted and in how birth dates are used. Because writers disagree, a reader comparing two sources can easily find that even their own method descriptions do not match.
Reading it as history
The Chaldean table is best treated as part of the history of numerology, which draws on older letter-number practices such as Hebrew gematria, and on a general fondness for giving a modern method an ancient origin. The claim of Babylonian descent is attractive but unsupported. The table works as a mechanical rule for turning letters into digits, and nothing about it has been shown to predict or describe anything about the person whose name is being counted.