Calculate Sum Of Digits In A Number String

Feb 22, 2010

I need to calculate the sum of digits in a numeric string. The function should keep on adding the digits of each result, till the final sum is a single digit. Please refer to the following example and result expected:-

Supposed the number entered in Cell A1 is 456789

Result 1 = 4+5+6+7+8+9 = 39

Result 2 = 3+9 = 12

Final Result required = 1+2 = 3

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