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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 from team Browserling.

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 from team Browserling.

Tool Options

Digital Root

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

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!

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 try!
click me

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
These options will be used automatically if you select this example.
Continuously sum digits until there's just one digit left.
click me

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
These options will be used automatically if you select this example.
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://onlinetools.com/number/calculate-digit-sum?input=42%0A-5045%0A2468042%0A99988877766655%0A11111111111111111111&digital-root=false

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Quickly test if the given numbers are palindromes.

Coming Soon

These number tools are on the way!
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Create a list of neat looking numbers.

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Visualize a number by drawing its digits as a color gradient.

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Show how a fp number is represented in a computer.

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Create a list of alphabetic numbers (a, b, c, …, z, aa, ab, …).

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Create a list of Roman numbers (i, ii, iii, iv, v…).

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Create a list of Braille numbers (⠂, ⠆, ⠒, ⠲, ⠢, …).

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Create a list of random binary numbers.

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Create a list of random octal numbers.

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Create a list of random decimal numbers.

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Create a list of random hexadecimal numbers.

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Calculate a cumulative sum of a list of numbers.

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Calculate a cumulative product of a list of numbers.

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Check if a number is a Fibonacci number.

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Check if a number is both a Fibonacci number and a prime.

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Create a sequence of Fibonacci words.

Construct Tribonacci Words

Create a sequence of Tribonacci words.

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Create a sequence of Tetranacci words.

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Generate Negalucas Numbers

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Calculate a series of extended Lucas numbers.

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Subtract one from every digit in a number.

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Print the biggest number in the world.

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Numberwang Number Test

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Created with love by

We're Browserling — a friendly and fun cross-browser testing company powered by alien technology. At Browserling we love to make peoples' lives easier, so we created this collection of number crunching tools. Our tools have the simplest user interface that doesn't require advanced computer skills and they are used by millions of people every month. Our number tools are actually powered by our web developer tools that we created over the last couple of years. Check them out!

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