Put your name into two numerology calculators and you will often get two different numbers. Most people assume one of them is broken.
Usually neither is. They are following different systems, and the systems genuinely disagree — they were built in different places at different times and they never agreed to begin with. What is missing is almost never accuracy. It is a label saying which tradition the answer came from.
There are four places the disagreement actually lives.
1. Which letter gets which number
This is the big one, and it accounts for most of the confusion about name numbers.
The Pythagorean system is the one nearly every website uses. It assigns 1 to 9 straight through the alphabet in order: A=1, B=2, C=3, and after I=9 it starts again at J=1. Simple, and easy to do in your head.
The Chaldean system does not run in alphabetical order at all. It assigns numbers by the sound a letter carries, the mapping is inherited rather than derived, and — the part that surprises people — it has no 9. In the Chaldean tradition nine is treated as sacred and is not assigned to any letter, so it can only ever appear as a total.
The same name therefore reduces to two different numbers, and both are correct within their own system. There is no arithmetic that reconciles them, because the disagreement is not arithmetic. Our calculator shows both, side by side, with the letters and their values printed out, precisely so you can see where the difference comes from rather than wondering which site to trust.
2. What counts as your name
Even inside one system, “your name” is not one thing:
- The full name on your birth certificate
- The name you actually use
- With or without a middle name
- Before or after marriage
- A name in Urdu or Arabic script, transliterated into Latin letters — and there is no single correct transliteration
Different practitioners use different answers here, and each is defensible. What is not defensible is a calculator that takes whatever you typed and reports the result as your number without saying which of those it assumed you meant.
3. Where the Lo Shu grid puts the digits
The Lo Shu grid has a second disagreement of exactly the same kind, and it is less well known.
The Chinese method and the Indian method place the digits from a date of birth into different cells of the square. Same date, same nine boxes, different grid — which means different numbers appear missing, and the arrows read differently.
Neither is a mistake. They are two traditions using the same diagram. But a site that implements one and calls it the Lo Shu grid will disagree with a site that implements the other, and neither will tell you why. We show both, labelled, because that is the only honest way to present a disagreement you cannot resolve.
4. Where the digits get added up
The smallest source of difference and a real one. Reducing a birth date can be done as one long sum of every digit, or by reducing the day, month and year separately and then adding those.
Most of the time these agree, because digital reduction is well behaved — the remainder after dividing by nine does not care how you group the addition. They come apart at the edges, particularly around how a total of 11, 22 or 33 is treated: some traditions hold those as master numbers and stop there rather than reducing them to 2, 4 and 6.
Whether your calculator holds a master number or reduces it is a decision it made for you, and it is usually not stated anywhere on the page.
So which one is right?
The question does not have an answer, and a calculator that implies it does is telling you something about itself.
What you can reasonably ask for is this:
- Say which system you are using. Pythagorean or Chaldean. Indian or Chinese placement.
- Show the working, so the number is reproducible on paper rather than asserted.
- Show both where two exist, rather than picking one silently.
- Say what was assumed about your name and your date.
That is the whole of what a calculator can honestly offer. Everything past that — what a number means for a person, what to do about it — is a practitioner’s judgement and not something arithmetic can hand you.
What this page is. It explains where these systems differ and how each one computes. It makes no claim about what any of the resulting numbers predict. Nothing here is medical, legal or financial advice.