Free Excel Column Letter ↔ Number Converter
Use this free tool to convert Excel column letters to numbers and back (A↔1, AA↔27). Fast, private, in your browser.
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What is Excel Column Converter?
Excel Column Converter turns spreadsheet column letters into their numeric index and back — A is 1, Z is 26, AA is 27, and so on. It is handy when working with spreadsheet code and APIs. It runs in your browser.
How to use this tool
- Enter a column letter or a number.
- Read the converted value.
- Copy the result.
Features
- Letter to number (A → 1)
- Number to letter (27 → AA)
- Handles multi-letter columns
- Instant two-way conversion
- Runs entirely in your browser
This tool runs in your browser. Your files and text are not uploaded to our servers, and we do not store your input.
Frequently asked questions
What is column AA?+
Column AA is number 27 — after Z (26) Excel continues with AA, AB, and so on.
Is there a column limit?+
It handles any valid spreadsheet column, well beyond the usual range.
Is anything uploaded?+
No. The conversion happens entirely in your browser.
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