Distinct Values in Excel

What this does

UNIQUE is a dynamic-array function in Excel 365 and Excel 2021 that returns the distinct values from a range, spilling the live result into the cells below. Unlike the Remove Duplicates data tool — a one-off action that permanently edits your data — UNIQUE is a formula that recalculates whenever the source changes, so a dropdown or report stays current. The optional by_col switches it to compare columns instead of rows, and exactly_once returns only the items that occur a single time. Because it spills, it needs empty cells below; if something blocks the spill it returns a #SPILL! error. 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 “distinct values 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 a formula is involved, keep the inputs labelled beside it, reference cells instead of typing values, and apply number formatting only after the result checks out. The point is a calculation you can defend to a CFO or an auditor, but the practical win is that someone else can open the file and understand what happened without asking you.

A worked example

Region names with repeats sit in A2:A100. =UNIQUE(A2:A100) spills a clean list of each region once — say West, East, North, South — into the cells below the formula. To list only regions that appear exactly once, add the third argument: =UNIQUE(A2:A100, FALSE, TRUE). To sort the distinct list, wrap it: =SORT(UNIQUE(A2:A100)). UNIQUE is the modern way to build live distinct lists — for dashboards, dropdowns and summaries — because it updates automatically and, unlike Remove Duplicates, never alters the underlying data. A practical tip before you scale it up: build it once on a small block of test data, confirm the number against the tool on this page, and only then point it at your real sheet. That one habit catches almost every mistake while it is still cheap to fix, long before a wrong figure reaches a report or a colleague.

In Google Sheets

Some functions on this page are newer additions to Excel: they are in current Microsoft 365 and Excel for the web, while older perpetual Excel versions return #NAME?. Google Sheets maintains its own function list, so confirm each function exists there before relying on the same formula. 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. If you take one thing from this page on “distinct values in excel”, make it the habit rather than the keystrokes: set the problem up with labelled inputs, reference those cells, and let Excel do the recomputing. Bookmark the page for the syntax, but do the example once in a blank sheet and check it against the tool above — five minutes of hands-on practice fixes the method in memory far better than re-reading, and it surfaces the small snags while they are still harmless. After that the technique is genuinely yours: faster than searching for it again, and reliable enough to drop into work that other people depend on.

Common mistakes

• Placing the formula where cells below are occupied, which blocks the spill and returns a #SPILL! error — clear the range underneath.
• Confusing UNIQUE with Remove Duplicates — Remove Duplicates is a one-off tool that deletes data, while UNIQUE is a live formula that leaves the source intact.
• Using UNIQUE in Excel 2019 or earlier, where it does not exist and returns #NAME?; fall back to Remove Duplicates or an advanced filter there.

Frequently asked questions