Write your full date of birth
Add all the digits of your birth date together
Keep adding the digits until you get a single digit
The final single digit is your Mulank number
Example: 15/08/1992
1 + 5 + 0 + 8 + 1 + 9 + 9 + 2 = 35
3 + 5 = 8
Mulank number = 8