CSV Tools

Percentage of Total

Add a column showing each row's share of the total

CSV Input

Try a sample:

Options

Provide CSV input above to select a column.

CSV Output

Select a column to see percentages...

More Options

CSV Format

Input

Output

Percentage format

How to Use This Tool

This tool adds a percentage-of-total column to your CSV. Select a numeric column and the tool appends a new column showing each row’s share of the column total.

  1. Provide your CSV — Paste CSV text into the input area, drop a CSV file onto the File tab, or enter a URL on the URL tab.
  2. Select a column — Choose the numeric column to compute percentages for.
  3. Get your output — Copy the result to your clipboard or save it as a .csv file.

FAQ

3 questions
Does this tool upload my data?
No. It runs entirely in your browser using JavaScript. Your CSV data is never sent to a server.
How is the percentage calculated?
Each value is divided by the sum of all non-empty values in the selected column, then multiplied by 100.
What format are the percentages in?
Percentages are shown as numbers with 2 decimal places (e.g., 45.23), without a % symbol, for easy downstream processing.

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