Excel List UNIQUE

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. For “excel list unique”, the reliable version is a short checking loop, not just the first command that appears to work. Run it on a deliberately small range first, watch how the affected list change, and only then apply the same setup to the full sheet. 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. That is what makes a data step that keeps your analysis trustworthy useful in real work: repeatable, auditable, and not dependent on memory or luck.

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. Check the referenced cells, argument order and result type in your workbook. Start with the worked example before changing an input, then compare the changed result with the calculation you expected. An error value or a result of a different type is a reason to inspect the inputs and arguments.

In Google Sheets

Function availability: UNIQUE: Excel 2021+. These are Microsoft's version markers; earlier perpetual releases do not include these functions. Check the actual product and update channel before using the formula. A marker does not establish an identical Web/Mac workflow or Google Sheets support. The aim was to get you unstuck fast and leave you a little more capable than a copy-paste would. The answer is at the top and the detail above shows why it holds — so the next time a colleague asks, you can answer without reaching for search. For “excel list unique”, keep the input cells and the result visible while you check the formula in Excel. Follow the worked example and change one input at a time. The steps explain the workbook calculation; this page does not run a live calculator for that task.

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