Math
Digital Root Calculator
Iterated digit sum of a non-negative integer.
Free to use — no sign-up or login.
Digital root
Digit sum
Amortization schedule
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This free Digital Root Calculator covers Iterated digit sum of a non-negative integer.
The digital root is n mod 9, except multiples of 9 (nonzero) become 9. Related math tools sit beside How it works, with no account required.
Using the Digital Root Calculator
Iterated digit sum of a non-negative integer. Typical inputs are n. How it works beside the form states the identity the Digital Root Calculator applies.
FAQ
How do I use the Digital Root Calculator?
Open the Digital Root Calculator, fill n, and read the result. The digital root is n mod 9, except multiples of 9 (nonzero) become 9.
What formula does the Digital Root Calculator use?
The Digital Root Calculator uses the identity in How it works. In words: The digital root is n mod 9, except multiples of 9 (nonzero) become 9.