Alphabet Charts: Pythagorean & Chaldean Values

The Pythagorean Chart (1–9)

The Pythagorean system is the one most Western numerology books use, partly because it is so easy to reproduce from memory. You write the numbers 1 to 9 in a row, then march through the alphabet placing one letter under each number, wrapping back to 1 when you pass 9.

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

Notice the pattern: A is the 1st letter so it is 1, J is the 10th so it reduces to 1, S is the 19th so it reduces to 1, and so on. Every letter's value is just its alphabet position reduced to a single digit. That self-checking quality is why beginners learn this chart first — if you forget a value, you can rebuild it by counting.

The Chaldean Chart (1–8)

The Chaldean chart comes from ancient Babylon and behaves very differently. It runs only from 1 to 8, and the number 9 is deliberately left out of the letter assignments because it was treated as sacred or holy — present in the final totals, but never tied directly to a letter.

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

There is no neat counting trick here. Letters were grouped by the vibration of their sound as the Chaldeans heard it, which is why C and G share a value while E and H do — to the ear of that tradition they rang at the same pitch. Because there is no shortcut, most practitioners simply keep this chart in front of them rather than trusting memory.

How Each Chart Was Derived

The two charts answer the same question — what is a letter worth? — from opposite starting points.

The Pythagorean chart is positional. It assumes the alphabet's order is itself meaningful, so it maps order onto number: position 1 to 9, then repeat. It is named for Pythagoras because it grows out of his teaching that everything can be expressed in number, though the letter-mapping in this exact form is a much later Western refinement.

The Chaldean chart is phonetic. It predates the modern alphabet and was built around how words sounded when spoken aloud, on the belief that a name's power lives in its vibration, not its spelling on paper. That is also why it tops out at 8: 9 stood apart as a number you could reach by addition but never assign on purpose. So one chart trusts the alphabet's sequence, and the other trusts the ear.

The Key Differences at a Glance

Three differences matter in practice. First, range: Pythagorean uses 1–9, Chaldean uses 1–8 with 9 reserved. Second, logic: Pythagorean is sequential and predictable, Chaldean is sound-based and must be memorised or looked up. Third, the numbers themselves often differ for the same letter — take the letter R. In Pythagorean it is worth 9 (R is the 18th letter, 1+8=9); in Chaldean it is worth 2. That single gap is enough to push a name to a completely different final number.

Work a quick example with the name SAM. Pythagorean: S=1, A=1, M=4, total 6. Chaldean: S=3, A=1, M=4, total 8. Same three letters, two different answers. This is why you must never mix charts inside one reading — choose your system first, then stay in it from the first letter to the last.

When Practitioners Use Each

Both charts are valid; the choice is about tradition and taste rather than one being correct.

Pythagorean numerology is the default across most Western books, apps and courses. It pairs cleanly with the Life Path and other date-based numbers, which are also reduced the same simple way, so a whole reading stays internally consistent. If you are learning numerology from English-language material, you are almost certainly being taught Pythagorean.

Chaldean numerology is favoured by many practitioners in India and the Middle East and by those who place special weight on a name's spoken vibration. It is the chart of choice when the work centres on names — name corrections, brand and baby names, where how a word sounds is felt to matter as much as how it is written. A common approach is to compute date numbers the Pythagorean way and analyse the name the Chaldean way, but if you do this, label clearly which chart produced which result so a reading never quietly contradicts itself.