Bulk mode
Convert a whole list at once
Paste a column of values — one per line, or separated by commas, tabs or spaces.
Results appear here as you paste.
How it works
Built for lists, not single lookups
Converting one value is easy anywhere. Converting three hundred is not, and that is the job this page exists for — a column of measurements out of a spreadsheet, a set of readings from an instrument, a parts list in the wrong units.
Values can be separated by new lines, commas, tabs or spaces, so a pasted spreadsheet column and a comma-separated list both work without reformatting. Everything runs in your browser: nothing is uploaded, which matters if the numbers are not yours to share.
Anything that is not a number is flagged in place rather than skipped. A silently shortened list is worse than an obvious error, because you would have no way of knowing a row went missing.
Working from a spreadsheet
Converting an Excel or Google Sheets column
Spreadsheets can convert units with a formula, but only if you know the factor and are willing to add a helper column. For a one-off job it is usually quicker to select the column, copy it, and paste it here.
- Select the cells you want to convert and copy them.
- Paste into the box above — one value per row is handled automatically.
- Choose the unit you are converting from and to.
- Copy the results back into an adjacent column, or download the CSV if you would rather keep the original and converted values side by side.
Common uses: converting a parts list from inches to millimetres, a set of weights from pounds to kilograms, sensor readings from Fahrenheit to Celsius, or file sizes between gigabytes and gibibytes. Anything the single-value converters handle works here too — every converter page also has a bulk tab.
Questions
Frequently Asked Questions
- How do I convert multiple values at once?
- Paste them into the box above, one per line or separated by commas. Every value is converted as you type, so there is no button to press and no limit on how many times you can change the units.
- Can I batch convert a column from Excel or Google Sheets?
- Yes. Select the cells, copy, and paste straight in — a copied spreadsheet column arrives as one value per line and is handled without reformatting. Download CSV gives you the input and output side by side to paste back.
- How many values can I convert at once?
- Up to 5,000 in a single paste. Beyond that the page tells you it has only converted the first 5,000 rather than quietly dropping the rest.
- What separators are supported?
- New lines, commas, tabs, semicolons and spaces. That covers a column copied from Excel or Google Sheets, a CSV fragment, and a plain space-separated list.
- Are my numbers uploaded anywhere?
- No. The conversion runs entirely in your browser using JavaScript. Nothing is sent to a server, so the tool works offline once the page has loaded.
- Can I get the results as a file?
- Yes. Download CSV gives you a two-column file with the original input alongside the converted value, which pastes straight back into a spreadsheet.
- Why is one of my rows showing an error?
- It could not be read as a number. Stray text, a unit symbol typed alongside the figure, or a currency prefix will all do it. Fix the row in the input box and the result updates immediately.
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