Calculate the sum of all digits of a given integer. Optionally compute the repeated digit sum (digital root) until a single digit is obtained.
Calculate the sum of all digits of a given integer. Optionally compute the repeated digit sum (digital root) until a single digit is obtained.
Enter any non-negative integer
The digital root is obtained by repeatedly summing digits: dr(n) = 1 + ((n - 1) mod 9) for n > 0.
How this calculator works
The digital root is obtained by repeatedly summing digits: dr(n) = 1 + ((n - 1) mod 9) for n > 0.
Common questions about this calculator
