Here is a tutorial to lock or hide only the formula cells in an Excel workbook. You can also lock formulas in all worksheets in a workbook.

Crisis averted–kind of. Permission to copy the entire workbook is another problem. For instance, if you open a protected Excel file in the browser edition, you can see hidden formulas.

Safeguard your Excel worksheets from accidentally deleting formulas or data sets by locking important cells, while leaving the rest of the worksheet editable.

Four ways to protect your Excel formulas (free PDF) If a user inadvertently changes the formulas in your Excel workbooks, all your hard work could go out the window.

Learn how to use Excel’s Allow Edit Ranges feature to assign editable cells, protect data, and streamline collaboration in shared workbooks.

If you have sensitive data you'd like to keep from prying eyes in a Microsoft Excel file, the easiest way to protect it is with Excel's built-in password tools.