FREE Calendar Calculation Formula with Examples

How to calculate what calendar to buy:

Calculate a Personal Year number

Summarize all numbers of the day of your birth and get to single-digit number. For example, if you are born on 14, the single-digit number is 5

 14 = 1+ 4 = 5

If you are born on 10, the single-digit number is 1

10 = 1 + 0 = 1

21 = 2 + 1 = 3

29 = 2 + 9 = 11, 1 + 1 =2 ( A single digit in this example is 2)

Summarize the numbers of the month of your birth to get a second single-digit number.

For example, if you are born in December, your number will be 3

 12 = 2 + 1= 3

If you are born in October, month 10, your number will be 1

1 + 0 = 1

Summarize the two above numbers (day and month) and a current year number (2025=9). Bring this sum to a single-digit number. Notice, your year of birth is not part of this calculation

For example: 

14 + 12 + 2025

5 + 3 + 9 = 17

1 + 7 = 8

In this example, the 2025 calendar number 8 is for person born on December 14.