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Tool Factory

Numbers, Units & Calculators

Sum Numbers

Add a list of numbers and show the total.

Tool workspace

Your input stays in this browser.

Add the required input to continue.

Needs input

You can run the tool again after any change.

Sum options

Number detection

Your result appears here

Add a list of numbers and show the total.

This tool runs open-source code from OmniTools (MIT License). See open-source credits.

Sum Numbers adds a list of numbers and can show each exact running total.

It returns the running totals 0.1, 0.3, and 5.3. The calculation runs in your browser. Processing runs in the browser.

Instructions

  1. Provide values for this tool.
  2. Enter numbers on separate lines.
  3. Select detection or a known separator.
  4. Enable running sum when intermediate totals matter.

Example

Input: 0.1 0.2 5

Settings: Sum Numbers: Detect numbers: on; running sum: on.

Result: It returns the running totals 0.1, 0.3, and 5.3.

Limits

  • Sum Numbers: Input is limited to 1,000,000 characters and 10,000 entries.
  • Sum Numbers: Each number allows 1,000 digits and exponents from -1000 to 1000.
  • Sum Numbers: It does not interpret thousands separators.

Questions

Can you add these numbers for me?

Yes. Paste 0.1, 0.2, and 5 on separate lines to get a total of 5.3. Enable running sum to see 0.1, 0.3, and 5.3. The tool does not interpret thousands separators.

How do I add negative numbers and decimals correctly?

Detect numbers preserves signs, decimal points, and scientific notation. Supported decimal totals stay exact: 0.1 plus 0.2 produces 0.3. Choose Use a separator when complete values share a known separator. Detect numbers treats commas as separators. The tool does not interpret thousands separators.

Why does the sum tool ignore some text entries?

Use a separator skips blank entries and ordinary nonnumeric text. Nonfinite values and incomplete scientific notation produce an error. Enter \n for new lines, \t for tabs, or a literal separator such as a comma. A completed sum does not prove that every input item was valid.

Can I show a running total after each number?

Enable running sum to output each exact cumulative total. For example, 9007199254740992 followed by 1 ends at 9007199254740993.

What size limits apply to exact sums?

Input can contain at most 1000000 characters and 10000 entries. Each number can contain at most 1000 digits, excluding its exponent. Scientific exponents must stay between -1000 and 1000. Each total can contain at most 4096 characters. Running output can contain at most 1000000 characters.