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Integer digit adder

World's simplest integer tool

This browser-based utility adds all the digits in an integer and prints the found sum to the screen. You can find the digit sums for several integers in parallel by entering each integer on a new line. If you enable the option for iterative digit summation, then you can also find the root of the digit sum. Created by math nerds from team Browserling.
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Iterative Summation
Find a single-digit root by iteratively summing the digits of the results, until only one digit remains.
Integer digit adder tool What is a integer digit adder?
With this online tool, you can find the sum of all digits in an integer. For example, if you enter the integer 12 in the input box, you'll get 1 + 2 = 3 in the output box. Similarly, a three-digit integer 248 will produce 2 + 4 + 8 = 14. You can calculate the sum of digits of several integers at once by just writing each value on a separate line. By default, the summation algorithm simply adds all integer digits and prints the result but you can also reapply the algorithm to the found result and repeat this process recursively until a single-digit value is reached. For example, given the integer 9875, the program calculates the sum the first time: 9 + 8 + 7 + 5 = 29, then again: 2 + 9 = 11, and again: 1 + 1 = 2. Now a single-digit integer is reached, so this is the end of the algorithm. The process of recursive digit summation is also called "repeated digital sum" or "additive digital root" and it can be configured in the options. Integerabulous!
Integer digit adder examples Click to use
Integer Digit Sum
In this example, we enter several integers in a column as input and get the sum of digits for each integer in the output. The app preserves the order of input integers as well as positive and negative signs before them.
123 -45 50505 234432 123456789 +99999999999
6 -9 15 18 45 +99
Required options
These options will be used automatically if you select this example.
Find a single-digit root by iteratively summing the digits of the results, until only one digit remains.
Integer Digital Root
This example performs a continuous summation of the integer digits using the "Repeated Digital Sum" mode. This mode adds the digits in each integer as many times as necessary to obtain a single-digit result.
1 22 333 4444 55555 666666 7777777 88888888 999999999
1 22 → 4 333 → 9 4444 → 16 → 7 55555 → 25 → 7 666666 → 36 → 9 7777777 → 49 → 13 → 4 88888888 → 64 → 10 → 1 999999999 → 81 → 9
Required options
These options will be used automatically if you select this example.
Find a single-digit root by iteratively summing the digits of the results, until only one digit remains.
Pro tips Master online integer 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://onlineintegertools.com/add-integer-digits?input=123%0A-45%0A50505%0A234432%0A123456789%0A%2B99999999999&digital-root=false
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