Digital Root Calculator

The digital root of a non-negative integer is the single-digit value obtained by an iterative process of summing digits, on each step using the result from the previous step as input to the digit summation. The process continues until a single-digit number is reached.

Example for the number 345:

1. Sum the digits: \(3 + 4 + 5 = 12\)
2. The result, 12, is not a single digit, so we repeat the process.
3. Sum the digits of 12: \(1 + 2 = 3\)
4. The result, 3, is a single digit, so this is the digital root.

Disclaimer: This calculator is for educational purposes only. While we strive for accuracy, please verify all results for critical applications.