Work out lucky number instantly with clear inputs, formula shown and shareable results.
All the digits of the date are added to your chosen number and repeatedly reduced by digit summing until a single digit remains, which is the digital root. This is for entertainment only: the digital root is a genuine arithmetic operation, equal to the number modulo nine, but it carries no predictive meaning.
Digit sum
sum = add every digit of the date, then add your favourite number
Digital root
reduce by digit summing until one digit remains, which equals ((n - 1) mod 9) + 1
sum = add every digit of the date, then add your favourite number. All the digits of the date are added to your chosen number and repeatedly reduced by digit summing until a single digit remains, which is the digital root.
This is for entertainment only: the digital root is a genuine arithmetic operation, equal to the number modulo nine, but it carries no predictive meaning.
Enter date of birth, your favourite number. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.