In Excel: every cell is already marked Locked, but locking only takes effect once you turn on Review ▸ Protect Sheet; to lock just some cells, first unlock the rest via Format Cells ▸ Protection (uncheck Locked), then Protect Sheet.
Select all cells, open Format Cells (Ctrl+1) ▸ Protection, and confirm Locked is ticked (it is by default).
Select only the cells people should still edit, reopen Format Cells ▸ Protection, and uncheck Locked.
Go to Review ▸ Protect Sheet, choose what users may still do, and set a password if you want.
Click OK — the locked cells are now read-only while the unlocked ones accept input.
What this does
The mechanism surprises most people: in a new sheet every cell already carries the Locked attribute, yet that attribute does nothing until you protect the sheet. So locking works in two layers. The Locked checkbox under Format Cells ▸ Protection marks which cells should be frozen, and Review ▸ Protect Sheet is the switch that actually enforces it. To make only some cells uneditable, you unlock the ones people should still type in (uncheck Locked for them), then Protect Sheet so the still-locked cells become read-only. Keep the inputs visible and clearly labelled and the whole thing stays auditable — anyone who opens the file later, including you, can see at a glance exactly what feeds the result and change one assumption without hunting through the formula. The difference between a quick fix and a sheet you can trust is the extra minute you spend validating “lock certain cells in excel”. Start on a copy or a tiny sample, keep the affected cells visible, and compare the result with the tool above before you touch the real workbook. When this is a ribbon command, the selection matters more than the button: confirm the range, apply the command, then spot-check the output before saving. The point is a layout choice that keeps the sheet readable and sortable, but the practical win is that someone else can open the file and understand what happened without asking you.
A worked example
A form has input cells in column B and a calculated formula in column C that must not be touched. Select B2:B20, open Format Cells (Ctrl+1) ▸ Protection, and uncheck Locked — those input cells are now exempt. Leave column C as-is (still Locked). Now Review ▸ Protect Sheet, optionally set a password, and click OK. People can type freely in column B, but any attempt to edit the formula in C2 is refused with "the cell is protected". Lock cells when you are handing a sheet to other people and want them to fill in some fields without breaking your formulas, headers or layout — budget templates, data-entry forms, shared trackers. It guides input to exactly the right places while keeping the working parts of the model safe. One habit worth forming early: name the cells that hold your inputs, so the formula reads in plain language instead of a string of cell addresses. A reviewer — or you in three months — can then follow the logic without decoding what B7 and D2 were supposed to mean, which is most of what makes a sheet maintainable.
In Google Sheets
Everything above works in Google Sheets too. Excel and Sheets share the formula syntax used here; only the surrounding menus are arranged differently. That portability is deliberate — learn it once and it follows you between the two tools and across Windows and Mac. Keep this page bookmarked for the next time the same question comes up. Better still, rebuild the example once in your own sheet — doing it yourself, with the tool above to check against, is what turns a copied formula into a technique you own. Here is the takeaway for “lock certain cells in excel”: copy the answer if you are busy, but if you have a spare few minutes, rebuild the example in Excel yourself with the tool above open beside it. That single pass — type it, run it, watch the result move when you change an input — is what turns a formula you found into a technique you trust. Keep your inputs labelled and referenced, never hard-coded, and the same sheet stays correct and auditable as it grows. Done that way, you will not need to look this up again, and you will be the person others ask.
Common mistakes
- Ticking Locked and expecting it to work without protecting the sheet — the Locked attribute does nothing until Protect Sheet is on.
- Forgetting that all cells start Locked, so protecting the sheet without unlocking inputs freezes the entire sheet.
- Unlocking the cells you meant to protect by mistake — Locked must stay ticked on the formulas you want read-only.
- Confusing this cell-level locking with file encryption; locking controls editing, not whether the file opens.
Frequently asked questions
Why can I still edit a "locked" cell?
Because the sheet is not protected yet. The Locked attribute is dormant until you turn on Review ▸ Protect Sheet, which is what actually enforces it.
How do I lock only the formula cells and leave inputs open?
Unlock the input cells (Format Cells ▸ Protection ▸ uncheck Locked) while leaving the formulas Locked, then Protect Sheet — only the still-locked formulas become read-only.
Do I have to set a password to lock cells?
No. Protect Sheet works without a password; a password simply stops others from unprotecting the sheet and undoing your locks.
Other ways people ask this
People reach this page typing “lock certain cells in excel”, “how do i lock certain cells in excel”, “how do you lock certain cells in excel” and “how to print certain cells in excel”, among other phrasings; whichever wording you used, the fix above is the one you want.
Why do people search for this in so many different ways?
Because the same task has many names. “lock certain cells in excel”, “how do i lock certain cells in excel”, “how do you lock certain cells in excel” all point at the one operation explained on this page, which is why they all lead here.