This calculator will work out the digital root from any whole number. The digital root is the iterated sum of all the digits that make up a number. For example, the number 567 would compute as 5+6+7 = 18, 1+8 = 9. So the digital root of 567 is 9. Digital roots are used in numerology.
This calculator will handle very long numbers. For example, you could enter the number 9 one hundred times. The calculator will show you that the number was 100 digits long. 9 x 100 = 900 so you should see 900 in the sum of digits entered box. 9+0+0=9, so you should see 9 in the digital root box.