Chaldean vs. Pythagorean Numerology: What's the Difference?

While Pythagorean numerology (the system used on this site) is the most popular, it's not the only one. Chaldean numerology is an older, more mystical system originating in ancient Babylonia. It differs in two key ways.\n\nFirst, the number-to-letter assignments are different. Second, and more importantly, Chaldean numerology uses the name you are commonly known by, rather than your birth name, to calculate your numbers. The belief is that the name you use daily has a more immediate impact on your life and personality.\n\nThe number 9 is also considered sacred and separate in the Chaldean system, never assigned to a letter. Chaldean interpretations are often considered more spiritual and focused on the hidden forces at play, while Pythagorean is seen as more psychological and focused on character and life purpose. Exploring both can offer a richer, multi-layered understanding of yourself.