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A digit sum calculator adds together all the individual digits of a number. The sum of digits of 12345 is 1+2+3+4+5 = 15. Digit sums are used in divisibility rules (a number is divisible by 9 if its digit sum is divisible by 9), check digit algorithms, and computing digital roots.

Formel

Trin-for-trin guide

1. 1Separate the number into individual digits
2. 2Add all digits together
3. 3The result is the digit sum

Løste eksempler

Almindelige fejl at undgå

• ✕Including the decimal point in multi-digit sums
• ✕Forgetting negative signs don't affect digit sums