Chaldean vs Pythagorean Numerology: The Differences That Change Your Result

Chaldean and Pythagorean numerology turn letters into numbers using two different charts. The Pythagorean chart numbers the alphabet in order, 1 to 9, and repeats (A = 1 … I = 9, J = 1 …). The Chaldean chart, in the form popularised by the palmist and numerologist Cheiro in the early 20th century, uses only 1 to 8, assigns letters in a non-alphabetical pattern, and gives no letter the value 9. Ten letters score the same in both systems and sixteen do not, so the same name often reduces to a different number. The systems also differ on which name to use and how to treat two-digit totals.

The two charts side by side

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

The same Chaldean chart, grouped by value, is easier to memorise:

Value	Chaldean letters	Pythagorean letters
1	A, I, J, Q, Y	A, J, S
2	B, K, R	B, K, T
3	C, G, L, S	C, L, U
4	D, M, T	D, M, V
5	E, H, N, X	E, N, W
6	U, V, W	F, O, X
7	O, Z	G, P, Y
8	F, P	H, Q, Z
9	(none)	I, R

The agreeing letters are A, B, C, D, E, J, K, L, M and N. A name built only from those letters gives the same total in both systems. Names with I, R, S, T, H, O, U or Y, which covers most Indian names written in English, usually diverge.

A worked example

Take a made-up name, Kalpana Udaharan.

	K	A	L	P	A	N	A	Total
Chaldean	2	1	3	8	1	5	1	21
Pythagorean	2	1	3	7	1	5	1	20

	U	D	A	H	A	R	A	N	Total
Chaldean	6	4	1	5	1	2	1	5	25
Pythagorean	3	4	1	8	1	9	1	5	32

• Chaldean: 21 + 25 = 46 → 4 + 6 = 10 → 1 + 0 = 1
• Pythagorean: 20 + 32 = 52 → 5 + 2 = 7

One name, two systems, two different numbers, and both calculations are "correct" within their own rules. The full procedure, including first-name and full-name variations, is in Name number: a step-by-step calculation.

Differences beyond the letter chart

The chart is the biggest difference, but not the only one.

Question	Chaldean (Cheiro's approach)	Pythagorean (as commonly practised in Western numerology)
Which name?	The name you are most known by and actually use	Usually the full name at birth
Two-digit totals	Compound numbers (e.g. 46 before reducing) are given their own meanings alongside the single digit	Usually reduced straight to a single digit
Master numbers	Not central to Cheiro's method	11, 22 and often 33 are commonly kept unreduced
The number 9	No letter is 9, though a total can still reduce to 9	I and R are 9
Planetary links	Numbers tied to the Sun, Moon and planets	Mostly read without planetary links

Why no letter is 9 in the Chaldean chart. In Cheiro's Book of Numbers, Cheiro explains that the ancient masters assigned no single letter to 9 because it represented the nine-lettered name of God. That is his stated reason, a traditional belief rather than a historical finding. He also says that if a name totals 9, it is read as 9.

What is documented and what is tradition

• Established fact: both charts exist in the forms shown, and the arithmetic is mechanical.
• Attributed belief: Cheiro wrote that the Chaldean alphabet's "origin is lost in antiquity" and that it passed from the Chaldeans to the Hebrews. We found no independent historical evidence for that chain, so treat it as his claim. Both charts are applied to the modern Latin alphabet, which neither the ancient Chaldeans nor Pythagoras used. Whatever older ideas inspired them, the charts as used today are modern arrangements.
• Variation by practitioner: Chaldean charts are not perfectly uniform. Some writers alter individual letters, for example giving C or X different values, or assigning 9 to a letter. If two "Chaldean" calculators disagree, check whether they use the same chart.

Which system is used in India?

Many Indian numerologists use the Chaldean chart for names, combined with the Mulank and Bhagyank from the birth date and a planetary reading of each number (see Numbers 1–9 and their planetary associations). The Pythagorean chart is also widely used, especially in Western-influenced books and apps. We are not aware of a classical Sanskrit source for either letter chart; both are applied to names written in the Latin alphabet.

How to choose, and the trap to avoid

There is no evidence that either system describes people more accurately. Numerology is a traditional, symbolic practice, not a proven science. A sensible approach:

1. Pick one system and stay with it. Mixing values from both charts in one calculation produces a number that belongs to neither.
2. Use the same name rule each time. Decide whether you are working with your full birth name or the name you use, and stick to it.
3. Don't shop for a better answer. If you dislike your Chaldean number and switch to Pythagorean because it gives a "luckier" result, you are choosing the answer, not calculating it.
4. Be wary of urgent advice. If one system's number is used to push an immediate name change, a remedy or a paid report, pause. Read what name correction involves before changing anything.

The free numerology calculator lets you choose either the Chaldean or the Pythagorean chart, so you can see how your name scores in each. It keeps 11, 22 and 33 unreduced in both systems, so a total of 29 or 38, for example, shows as 11.