Numerology calculator
Reduction normally continues until a single digit remains, but 11, 22 and 33 are conventionally left alone as "master numbers". There is no arithmetic reason for the exception. It is a convention introduced in twentieth-century numerology and it is why some calculators disagree with others. This one keeps them, which is the more common modern practice.
Numerology and biorhythm theory are traditions, not sciences. Biorhythms were tested repeatedly in the 1970s and 80s and no predictive validity was found. This calculates what each tradition specifies, accurately, and claims nothing beyond that.
Pythagorean numerology gives the letters A to I the values 1 to 9 and repeats. Summing a name and reducing gives the expression number; the vowels alone give the soul urge, the consonants the personality. A birth date gives the life path. 11, 22 and 33 stay unreduced, and the biorhythm mode plots the 23, 28 and 33 day cycles.
How to work out a numerology number
Different schools use different letter values, which is why two numerology calculators frequently disagree. The Pythagorean system used here runs 1 to 9 cyclically through the alphabet and is by far the most common in English-language numerology. The Chaldean system maps the letters differently, omits the number nine entirely, and lands on a different answer for almost every name. Neither is the correct one; they are separate traditions, and any calculator worth using should say which it implements.
The life path is the other half of a reading and comes from the date, not the name, so a person has one of each and the two rarely agree. That is expected. There are also two ways to compute it: reduce the month, day and year separately and then add, which is what this does and what is more widely taught, or sum every digit of the date at once. They agree most of the time, and part company around master numbers, because 11, 22 and 33 can be created or destroyed depending on when the reduction happens.
Biorhythms sit alongside numerology here because they are the same kind of object: a figure derived from a birth date by a fixed rule. That rule is three sine waves of 23, 28 and 33 days, proposed by Wilhelm Fliess in the 1890s and revived in the 1970s, when it was finally tested. Hines's 1998 review of the literature found no relationship between biorhythm phase and accidents, performance or anything else. The arithmetic on this page is exact; what it means is nothing.
What people use it for
- Working out an expression number from a full name
- Comparing the Pythagorean values of two spellings of a name
- Finding a life path number from a date of birth
- Seeing which component numbers a life path was built from
- Plotting the 23, 28 and 33 day biorhythm cycles for a chosen date
- Finding how many days someone has been alive
- Understanding what a numerology reading was based on
- Checking a number quoted elsewhere
Questions
Each letter gets a value from 1 to 9, the values are summed, and the total is reduced by adding its digits until one remains.
Reduce the month, day and year to single digits, add them, and reduce the total. 15 July 1990 gives 7 + 6 + 1 = 14, which reduces to 5.
The same reduction applied only to the vowels in the name. The consonants alone give the personality number.
11, 22 and 33, which by convention are not reduced further. This calculator keeps them in every mode.
The full name as written at birth is the usual convention. A married or chosen name gives a different number.
Two methods exist: reducing the components first, or summing every digit of the date at once. They differ occasionally around master numbers.
No. The destiny or expression number comes from the name; the life path comes from the date.
Not for anything here. The life path and the biorhythm cycles both use the date alone.
Different letter values. Chaldean omits nine entirely and gives different answers for almost every name. This uses Pythagorean, the common English-language system.
Physical at 23 days, emotional at 28 and intellectual at 33, each running as a sine wave from the day of birth.
No. They were tested extensively in the 1970s and 80s and no predictive validity was found.
When a cycle crosses zero. The theory treats it as unstable; the evidence does not support that.
Every 21,252 days — about 58 years and two months after birth, because 23, 28 and 33 share no common factor.
Wilhelm Fliess in the 1890s, popularised again in the 1970s alongside the rest of the era’s pseudoscience.
It is a tradition with no evidential basis. This tool implements the arithmetic accurately and claims nothing beyond that.
Because of when the reduction happens. Reducing the components first can preserve a master number that summing every digit at once would collapse. This page reduces the components first.