The numerology guide

What numerology is

Numerology is the practice of turning a birth date or a name into a small number, usually 1 to 9, and reading a meaning off that number. Every calculation is the same two moves: convert something about you into digits, then reduce those digits until one is left.

That is the whole mechanism. What changes from one number to the next is only which part of you goes in: the date you were born, the letters of your name, the vowels alone, the consonants alone, the single day of the month. Each one is a different window onto the same person.

The five numbers you can work out here

Most of what numerology calls your "core" comes down to these five. Follow any one to work out yours and read the full write-up.

• Life Pathfrom your birth date

  the temperament the tradition leans on hardest.

• Expression · Destinyfrom every letter of your full birth name

  what you can do out in the open.

• Soul Urge · Heart's Desirefrom the vowels of your name

  what you privately want.

• Personalityfrom the consonants of your name

  the face you show a room before you speak.

• Birthdayfrom the day of the month you were born

  one specific gift you were handed.

The Life Path comes from your date of birth; the other four are read from your name, or, for the Birthday, from a single day. The name three (Expression, Soul Urge, Personality) fit together exactly: the vowels and consonants of a name partition it, so the Soul Urge and Personality sums add back to the Expression.

How reduction works

Reduction is the one rule underneath everything. You add up the digits, and if the total is bigger than 9, you add its digits together too, and you keep going until a single digit is left. Here is a birth date worked all the way down:

A Life Path 7. The day, month, and year are each reduced on their own first, then those three are added and reduced once more. It is arithmetic you can check on the back of an envelope, which is the point: nothing here needs to be taken on faith.

There is one exception. The totals 11, 22, and, for some practitioners, 33 are left alone rather than reduced. These are the master numbers, and they havetheir own section below.

Master numbers

When a total comes to 11, 22, or, for some practitioners, 33, you leave it as it is instead of adding its digits. These are the master numbers, and they are the one place the reduction rule stops early.

Each still sits above the single digit it would fold into, and keeps that digit underneath it. An 11 carries the 2 (1 + 1); a 22 carries the 4; a 33 carries the 6. The reading holds that a master number is a stronger, harder-to-live-out form of the digit below it: the 11 as a more demanding 2, the 22 as a more demanding 4. If your total lands on one, you stop there rather than fold it down.

Worth knowing where the emphasis comes from. The arithmetic is plain, but singling out 11 and 22 belongs to modern numerology, not the older number symbolism; it is part of the personality reading rather than the ancient cosmology. If your number is a master number, read the digit underneath it too. The two together usually fit better than either on its own.

Turning letters into numbers

Three of the five numbers start from your name rather than your birth date, so they need a way to turn letters into digits. The common method is the Pythagorean chart: the alphabet laid out in nine columns, each letter taking the number above it.

From here the three name numbers just differ in which letters they count. The Expression uses every letter. The Soul Urge uses the vowels alone. The Personalityuses the consonants. Each column's letters add up, then reduce by the same rule as any date.

The split of a name into vowels and consonants is old arithmetic with a newer meaning laid over it. Turning letters into numbers goes back to gematria, attested in an Assyrian inscription from the 8th century BCE, and in 1533 Cornelius Agrippa mapped values across the Latin alphabet. Reading the vowels as your inner life is the modern part.

Where all this comes from

The symbolism is genuinely old. The practice you would recognize as numerology is not, and it is worth knowing where the seam runs.

The ancient tradition has a name: arithmology, the Greek study of what numbers mean rather than what they do. Its questions were cosmological. Why is 4 "justice"? Because a square divides into equal parts. Why is 7 "the virgin"? Because within the first ten numbers it has no factors. Nicomachus of Gerasa set this down around 100 CE, and hisIntroduction to Arithmetic became the text most later Western number symbolism descends from. The paper trail runs back roughly 2,400 years, and the sources still exist.

What none of them said was that your birth date made you a leader, or a free spirit, or drawn to money. Reading a number as a personality is much younger. It belongs to early-1900s American New Thought; the writer most often credited is L. Dow Balliett, whose books between 1903 and 1917 reworked the old symbols into character traits. The word "numerology" is first attested around 1911.

So the symbolism is roughly 2,400 years old and the personality reading is roughly 120. Both are worth knowing. Each number's page marks where the old meaning ends and the modern invention begins, and theabout page lays out the sources in full.

How to read your numbers

A number is better used as a lens than a forecast. It will not tell you what happens on Tuesday, and it will not pick your career. What it is good for is recognition: hold it up against your own life and keep the parts that actually fit. The parts that sting a little are usually the ones worth sitting with. The parts that don't, you are free to leave.

If you take one thing from this page, let it be that you can always check the math yourself. Work out your number, read where its meaning came from, and decide for yourself what to do with it. What have you been hoping a number might tell you?