Sum CSV Rows

Sum CSV Rows instantly in your browser. Append totals to each row of comma-separated data with options to skip headers, round sums, and export the results.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .csv, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
Total characters: 0
Options
Skip header row
Round sums
Maximize output

How to Use:

  • Paste your CSV data into the Input Text box or use the sample that’s already there.
  • You can also import a file by clicking Choose File. Accepted formats include .csv, .txt, .tsv, .json, .xml, and other safe plain-text files.
  • The tool adds a total to the end of each row by summing all numeric values in that row.
  • Use the Skip header row toggle if your first line is a header and shouldn’t be summed.
  • Enable Round sums if you want the total values rounded to the nearest whole number.
  • Turn on Maximize output to get a taller view of the results in the output box.
  • The preview updates instantly as you type or toggle settings.
  • Click Copy Output to copy the final result.
  • Use Export to File to download the updated CSV with row sums.
  • The Clear All button resets everything to blank, including the file name.
  • A live Total characters counter is displayed under the output box.

What Sum CSV Rows can do:

Sum CSV Rows processes each line of your CSV and totals the numeric values, placing that total at the end of the row. You can skip headers, round results, and immediately preview the changes. It’s perfect for data that needs totals per transaction, row, or group without writing any formulas or scripts. The tool works entirely in-browser and responds to your changes in real time.

Example:

Before:

10,20,30
5,15,25
1,2,3

After:

10,20,30,60
5,15,25,45
1,2,3,6

Common Use Cases:

Whether you’re working with financial records, scores, logs, or simple spreadsheets, adding row totals helps with reporting, auditing, and analysis. Use it to quickly prepare data for summaries, import into systems that require totals, or just to double-check your figures before sending a file off.

Useful Tools & Suggestions:

Before summing, run Delete Empty CSV Values to make sure no blank cells throw off your totals. And if you want to go further, Average CSV Rows gives you a cleaner view of the overall trends.

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