Your lucky number

This is for entertainment. Numerology has no scientific basis, and no number derived from a date can predict anything about a life. It is set out here because it is an old and internally consistent system that people enjoy — not because it works.

How the calculation works

The life path number is the oldest and most widely used figure in Western numerology. Each part of the date — day, month, year — is reduced to a single digit by adding its digits together, repeatedly, until one digit remains. Those three results are added, and the sum is reduced the same way.

Take 4 July 1975. The day is already 4. The month, 7, is already single. The year reduces: 1 + 9 + 7 + 5 = 22, and 22 is kept rather than reduced further, for the reason below. Then 4 + 7 + 22 = 33, which is also kept. The life path is 33.

Master numbers

Three numbers — 11, 22 and 33 — are left unreduced wherever they appear. This is the Pythagorean convention, and it is the point where numerology systems most often disagree: some reduce them anyway, giving 2, 4 and 6 instead. This calculator keeps them, and says so when it does, because the two schools give different answers and a result that hides which one it used is not much use.

Why 9 and not 10

The system runs on nine digits because it predates the widespread use of zero in European arithmetic. Reducing any number by adding its digits is equivalent to taking its remainder when divided by nine — which is why the digits 1 to 9 close the circle and 9 is read as completion. The mathematics is real even where the interpretation is not.

Nothing is stored

Your date of birth is used in your browser and nowhere else. No request is made and nothing is saved — close the tab and it is gone.