How to Use

1. Enter any positive number
2. Click the "Calculate Digital Root" button
3. The digital root and calculation steps will be displayed below

What is a Digital Root?

The digital root of a number is the recursive sum of all its digits until a single digit is obtained. For example:

Properties

• The digital root is always a single digit (1-9)
• If a number is divisible by 9, its digital root is 9
• If a number is not divisible by 9, its digital root is the remainder when divided by 9
• The digital root of 0 is 0

Applications

• Number theory and mathematical patterns
• Check digit calculations
• Divisibility tests
• Mathematical puzzles and games