# Convert column letter to number

To convert a column letter to an regular number (e.g. 1, 10, 26, etc.) you can use a formula based on the INDIRECT and COLUMN functions.

In the example shown, the formula in C5 is:

### How this formula works

The first step is to construct a standard "A1" style reference using the column letter, by adding a "1" with concatenation:

B5&"1"

This results in a text string like "A1" which is passed into the INDIRECT function.

Next, the INDIRECT function transforms the text into a proper Excel reference and hands the result off to the COLUMN function.

Finally, the COLUMN function evaluates the reference and returns the column number for the reference.

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