# Digit sum calculator

## World's simplest number tool

Quickly calculate the sum of digits in your browser. To get the digit sum, just enter your numbers in the input field, and this utility will add up all the digits of the given numbers. Created by developers for developers.

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A link to this tool, including input, options and all chained tools.

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Digit sum calculator tool
What is a digit sum calculator?

This is a browser-based online utility for calculating the sum of digits of a number. To calculate the sum for several numbers at once, you can enter each of them on a new line. You can also find the digital root. The digital root is a one-digit number, which is obtained by continuously summing the digits until only a single digit number is left. That's numberwang!

Digit sum calculator examples
Click to use

Sum of Digits for Five Numbers

In this example, we sum up the digits for five numbers at once. If the given value is negative, we keep its sign before the result.

42
-5045
2468042
99988877766655
11111111111111111111

6
-14
26
100
20

**Required options**

Continuously sum digits until
there's just one digit left.

Repeated Digital Sum

In this example, we calculate the digital root for nine numbers of various length. The tool displays the process of summing digits until a single value is obtained in details.

1
12
123
1234
12345
123456
1234567
12345678
123456789

1
12 → 3
123 → 6
1234 → 10 → 1
12345 → 15 → 6
123456 → 21 → 3
1234567 → 28 → 10 → 1
12345678 → 36 → 9
123456789 → 45 → 9

**Required options**

Continuously sum digits until
there's just one digit left.

Pro tips
Master online number tools

You can pass input to this tool via

__?input__query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!
https://onlinenumbertools.com/calculate-digit-sum

__?input__=42%0A-5045%0A2468042%0A99988877766655%0A11111111111111111111&digital-root=false
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