Distinct List 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. For “distinct list in excel”, 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 layout choice that keeps the sheet readable and sortable 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. If there is any chance you will reuse this, drop it into a small template tab right now: a labelled input area on the left and the formula beside it, checked once against the tool above. Next time the same question comes up, the answer is a single paste away instead of a rebuild from memory.

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. 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, the tool proves it, and the detail above shows why it holds — so the next time a colleague asks, you can answer without reaching for search. The short version of “distinct list in excel”: the answer is at the top of this page, the tool proves it on your own numbers, and the sections above explain why it holds so the next variation does not stump you. Excel rewards people who reference cells instead of typing values and who keep inputs separate from formulas, because that is what makes a result you can audit months later. Build it once, deliberately, with the live tool as a check, and you convert a one-off lookup into a reusable skill — which is the whole point of learning the why and not just the what.

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