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Digit Sum | Digit Product

# Calculate Digit Sum

The digit sum is the sum of the ciphers of a number. To calculate, just type or paste any text with numbers into the field and press *Calculate digit sums*. Characters, which aren't numbers, are counted, but ignored for the digit sums. For the *alternating digit sum*, the numbers are alternatingly added and subtracted: z1-z2+z3-z4+z5-... . For the *iterated digit sum*, the digit sum is executed until the result is one-digit.

**Digit sum**:

Example: the digit sum of 1234 = 1+2+3+4 = 10

If a number is divisible without remainder by 3 or 9, then the same is true for its digit sum and vice versa. Furthermore, digit sums are used as checksums for number values.

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