Write your full date of birth in DD/MM/YYYY format
Add all the digits of your date of birth
Keep adding the digits until you get a single digit
That single digit is your Mulank
Example: 14/07/1995
1 + 4 + 0 + 7 + 1 + 9 + 9 + 5 = 36
3 + 6 = 9
So, Mulank = 9