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.

The ability to lock cells or elements of Microsoft Excel and Google Sheets, but not the full sheet, allows maximum customization and control of a project.

To lock specific cells in Excel, select all cells in the sheet, then hold the Ctrl key and highlight the ones you want to protect. This will deselect them from the current selection.