Pythagorean numerology is the most widely used numerology system in the Western world. Learn how it assigns number values to letters, how it differs from Chaldean numerology, and why it's used.
Pythagorean numerology is the most widely practised numerology system in the Western world. It assigns number values to letters of the alphabet sequentially — A=1, B=2, C=3... I=9, J=1, K=2... — cycling from 1 through 9 repeatedly. Named after the Greek philosopher Pythagoras, who is credited with establishing the philosophical framework that numbers carry meaning beyond their mathematical function, this system underlies most modern Western numerology calculations.
The Pythagorean assignment: A,J,S=1 | B,K,T=2 | C,L,U=3 | D,M,V=4 | E,N,W=5 | F,O,X=6 | G,P,Y=7 | H,Q,Z=8 | I,R=9. Apply these values to your full birth name to calculate the Expression Number and other name-based numbers.
The Pythagorean system is used to calculate name-based numbers: the Expression Number (all letters), the Soul Urge Number (vowels only), and the Personality Number (consonants only). It treats the alphabet as a reflection of the numerical cycle, with each letter carrying the vibrational quality of the number it maps to.
The name JAMES: J=1, A=1, M=4, E=5, S=1. Total: 1+1+4+5+1=12→1+2=3. James has an Expression Number of 3. The vowels A and E: 1+5=6. Soul Urge Number is 6. The consonants J, M, S: 1+4+1=6. Personality Number is also 6.
Chaldean numerology assigns values differently (not sequentially) and is considered the older system. The key differences: Chaldean does not assign the value 9 to any letter (9 is considered sacred), while Pythagorean does. Chaldean uses the name you commonly go by; Pythagorean traditionally uses your full birth name.
This is contested. Pythagorean is more widely used in the Western world and is what most modern numerology software and practitioners use. Chaldean is considered by some practitioners to be more precise, particularly for name analysis.
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