Digital Root Calculator

This function returns the digital root of the specified argument. A non-negative integer must be specified as an argument.

The digital square root is the sum of adding individual digits of a number, repeating the addition with the sum until we get a one-digit result.

To calculate, enter a non-negative integer, then click the 'Calculate' button.

Example

Digital root of 12846

\(\displaystyle 1 + 2 + 8 + 4 + 6 = 21\)

\(\displaystyle 2 + 1 = \color{blue}{3}\)

The digital root can also be calculated using the following formula

\(\displaystyle dw= 1 + (n - 1) % 9 \)