Numerology reduces a birth date and a name to single digits and assigns each digit a planet. The calculator above does that, showing every step of the arithmetic.
It also says something the other pages on this site do not need to: there is no astronomy here at all.
What this is not
Every other tool on this site computes where a body actually was. A panchang reads the Moon's position. A kundli reads nine of them. Those are measurements, checkable against any ephemeris in the world.
The numbers on this page come from two things: the digits of a date in the Gregorian calendar, and the letters of a name in the Latin alphabet.
Neither existed in India when the jyotisha texts were written. The Gregorian calendar was promulgated in 1582 and adopted in India under British administration. The Latin alphabet is not a script any Indian language was written in. So a system that computes from Gregorian digits and Latin letters cannot be reading anything the classical texts described, whatever it is doing.
This matters because numerology is routinely sold alongside jyotisha, in the same consultation, by the same people, as though the two were branches of one tradition. They are not, and the distinction is not subtle: one system computes planetary positions and the other adds up the digits in a date.
That is not an argument that numerology is worthless. It is an argument for knowing which thing you are being handed.
The three numbers
Mulank, the psychic number, is the day of the month reduced to a single digit. Born on the 7th, your mulank is 7. Born on the 25th, 2 + 5 = 7 as well.
Bhagyank, the destiny number, is every digit of the full date added and reduced. For 7 June 1990: 7 + 6 + 1 + 9 + 9 + 0 = 32, and 3 + 2 = 5.
Namank, the name number, adds the values of the letters in your name. The letter values come from the Chaldean table, which is the one Indian practice inherited.
Each digit is then assigned a graha: 1 Sun, 2 Moon, 3 Jupiter, 4 Rahu, 5 Mercury, 6 Venus, 7 Ketu, 8 Saturn, 9 Mars.
That assignment is a convention with no derivation given anywhere, and a late one. It is worth noticing that it hands 4 and 7 to Rahu and Ketu, which are not bodies at all but the two points where the Moon's orbit crosses the ecliptic. Assigning a shadow point to a digit is a category of claim quite different from saying where Saturn is.
The two name systems disagree, and almost nobody says which they used
There are two letter-value tables in circulation, and they give different answers.
Chaldean assigns letters values 1 to 8 and never uses 9, which is treated as set apart. Pythagorean simply runs A=1 through I=9, then J=1 through R=9, then S=1 through Z=8.
Those produce different totals for nearly every name. Across twenty common Indian names, the two systems agree on one.
A "name number" quoted without saying which table produced it is not a determinate quantity. It is one of two numbers, and the odds are against you knowing which.
This page uses Chaldean, states that it does, and shows both so you can see the gap.
The clearest test of which system a source is using: ask whether any letter maps to 9. In Chaldean none does. If a table gives a letter the value 9, it is Pythagorean regardless of what it is called.
Mulank is not evenly distributed
Here is something checkable that changes how a mulank should be read.
Your mulank is the day of the month reduced. Days 1 through 27 spread evenly across the nine digits, three days each. But months have 28, 29, 30 or 31 days, and those extra days, the 28th through the 31st, reduce to 1, 2, 3 and 4.
So digits 1 to 4 get a fourth day and digits 5 to 9 do not.
Counted over four real calendar years, mulank 1 falls on 192 dates and mulank 9 on 144. Mulank 1 is about a third more common than mulank 9, and the reason is the length of the months rather than anything about people.
Any claim that a mulank is rare, or that a particular one is unusually significant because few people have it, is a claim about the Gregorian calendar. And since the Gregorian calendar reached India in the colonial period, it is a claim about a nineteenth-century administrative decision.
Checking the skew yourself
The claim is easy to verify with nothing but a calendar, which is worth doing since it is the most concrete thing on this page.
Take any month with 31 days. Write out which digit each date reduces to: the 1st is 1, the 10th is 1, the 19th is 1 (since 1+9 is 10, and 1+0 is 1), and the 28th is 1 (2+8 is 10, then 1). Four dates.
Now do the same for 9: the 9th, the 18th, and the 27th. Three dates. There is no fourth, because the next would be the 36th.
Repeat for every digit and you get four dates each for 1, 2, 3 and 4, and three each for 5 through 9. Sixteen plus fifteen is thirty-one, which is the month.
February pulls the other way, ending at 28 or 29, which removes the fourth date from 3 and 4 and sometimes from 2. Averaged over real years the net effect still favours the low digits, which is what the counted figures show.
Master numbers
Some traditions preserve 11, 22 and 33 rather than reducing them, treating them as carrying additional weight.
This is a twentieth-century Western addition and is not part of the Chaldean system. The calculator therefore reports them separately: it gives you the reduced digit, which is what the Indian system uses, and notes when the reduction passed through a master number on the way.
That separation is deliberate. Folding a Western innovation silently into a result presented as traditional is exactly the kind of blending this page is trying to make visible.
What the arithmetic can and cannot be wrong about
This is the one tool on this site where two correct implementations must agree exactly.
There is no ayanamsa here, no ephemeris, no sunrise convention, no time zone, no birth time. The inputs are a date and a string, and the operations are addition and digit reduction. Given the same inputs and the same letter table, every implementation on earth returns the same answer.
That is a genuine virtue and worth stating. It also sharply narrows what a disagreement between two numerology sites can be about. If two sites give different name numbers, one of exactly three things happened: they used different letter tables, they treated the name differently (a middle name included or dropped, a spelling changed), or one made an arithmetic error. There is no third system of digit addition.
Compare that with a panchang, where two correct sites can differ on the ayanamsa, the sunrise definition, the time zone in force and the node convention, all legitimately. Numerology has no such room. Its answers are certain in a way its subject matter is not.
Why your number changes when your name does
A consequence worth drawing out, because it is where numerology's practical advice usually leads.
Since the name number is a sum of letter values, changing the spelling of a name changes the number. Adding a letter, dropping one, or switching from "Rahul" to "Rahull" moves the total and often the reduced digit.
This is the mechanism behind name-correction services, which charge to add or remove letters until the number is favourable. The arithmetic works exactly as advertised: the new spelling really does give the new number.
What the arithmetic cannot tell you is whether the number was ever attached to anything. A system in which the answer changes when you change the spelling of a Latin transliteration of a name written in another script is a system whose input is a fairly arbitrary string. That is not a criticism of the addition. It is an observation about what is being added.
The three numbers do not measure three things
One structural point, since the calculator presents three cards and it would be easy to read them as three independent readings.
Mulank is the day of the month. Bhagyank is the whole date, which includes the day of the month. So bhagyank is not independent of mulank: it is mulank plus the month and year digits, reduced. Two people born on the same day of the same month in the same year have identical values for both, necessarily.
That means the two date numbers carry less separate information than three cards suggest. There are only 31 possible mulanks-worth of variation in the day, and the bhagyank adds the month and year on top of it. For any given date, one determines a great deal about the other.
The name number is genuinely independent of both, being computed from a different input entirely. But it is also the one most easily changed, as the section above notes, which is an awkward property for something meant to describe a person.
What this page will not do
It will not tell you what your numbers mean, and it will not suggest changing your name.
What it computes is three digit sums, shown step by step, plus the letter values that produced the name number under both tables. All of it is checkable on paper in under a minute, which is more than can be said for most things sold under this heading.
The one substantive thing it adds is context that is usually missing: numerology has no astronomical content, its two letter tables disagree for nineteen names in twenty, and its psychic number is skewed by the lengths of the Gregorian months. None of those facts settles whether the system means anything. All of them are things you would want to know before paying someone who says it does.