Cleanup formula page
Unique List Formula
Use this when you need a clean list of owners, categories, IDs, or emails from a source column.
Create a unique list from a column.
The output contains each nonblank value once.
Copy formulas
=UNIQUE(FILTER(A2:A100, A2:A100<>""))=IFERROR(UNIQUE(FILTER(A2:A100, A2:A100<>"")), "No values")Google Sheets uses IFERROR here so an empty source range returns a friendly message.
Example data
| Region | Status | |
|---|---|---|
| maya@example.com | East | Active |
| noah@example.com | West | Active |
| maya@example.com | East | Active |
| West | Inactive |
Formula explanation
- FILTER removes blanks.
- UNIQUE returns each remaining value once.
- The output spills into cells below the formula.
What this formula does
Unique List Formula is built around UNIQUE. The example formula on this page is =UNIQUE(FILTER(A2:A100, A2:A100<>"")), and it is written against sample columns such as Email, Region, Status.
Excel and Google Sheets need different syntax for this task, so copy the version that matches the spreadsheet app you are using.
Cleanup formulas are usually dynamic array or row-check formulas. They are best used in helper columns or clean output areas where spilled results will not overwrite existing data.
Use this pattern for this task: Create a unique list from a column. Check blanks, hidden spaces, and spill space before assuming the formula is wrong.
| Syntax piece | Role in the formula |
|---|---|
| FILTER | FILTER removes blanks. |
| UNIQUE | UNIQUE returns each remaining value once. |
| Part 3 | The output spills into cells below the formula. |
Practical use cases
=UNIQUE(FILTER(A2:A100, A2:A100<>""))Excel: Use this in a helper column or clean output area to audit imported rows before they feed a report. Returns: The output contains each nonblank value once.
=IFERROR(UNIQUE(FILTER(A2:A100, A2:A100<>"")), "No values")Google Sheets: Use this before deduping, importing, or sharing a spreadsheet so suspicious rows are visible and easy to review. Returns: The output contains each nonblank value once.
Common errors
- Blank rows and hidden spaces can change duplicate or unique counts.
- Dynamic array formulas need empty output space to spill results.
- Case-sensitive cleanup needs different formulas than normal COUNTIF or UNIQUE patterns.
Common errors and troubleshooting
| Issue | Likely cause | Fix |
|---|---|---|
| Copied formula gives an unexpected result | Blank rows and hidden spaces can change duplicate or unique counts. | Check blanks, hidden spaces, duplicate keys, and available spill space before changing the formula. |
| Common setup problem | Dynamic array formulas need empty output space to spill results. | Check blanks, hidden spaces, duplicate keys, and available spill space before changing the formula. |
| Common setup problem | Case-sensitive cleanup needs different formulas than normal COUNTIF or UNIQUE patterns. | Check blanks, hidden spaces, duplicate keys, and available spill space before changing the formula. |
| Dynamic array will not spill | Cells below or to the right of the formula are not empty. | Move the formula to a clear output area or delete blocking values before expecting the result to expand. |
| Duplicate or unique result looks wrong | Blank cells, hidden spaces, or case differences make values that look identical behave differently. | Add TRIM or a blank guard when needed, and decide whether case-sensitive matching is required for the audit. |
When not to use this formula
- Do not use cleanup formulas as a replacement for source-system data fixes when the same issue keeps returning.
- Do not use dynamic array cleanup formulas in older Excel versions that do not support spilling.
Alternatives
| Alternative | When to use it |
|---|---|
| Duplicate Checker Formula Builder | Use for configurable duplicate flags with blank guards. |
| Count Unique Formula Builder | Use for distinct counts with blank handling. |
| CSV Column Cleaner | Use before importing messy CSV headers. |
Compare with related formulas
| Formula or tool | How it differs | Use it instead when |
|---|---|---|
| Duplicate Checker Formula Builder | Duplicate Checker Formula Builder solves a nearby workflow, while Unique List Formula is focused on create a unique list from a column. | Use for configurable duplicate flags with blank guards. |
| Count Unique Formula Builder | Count Unique Formula Builder solves a nearby workflow, while Unique List Formula is focused on create a unique list from a column. | Use for distinct counts with blank handling. |
| CSV Column Cleaner | CSV Column Cleaner solves a nearby workflow, while Unique List Formula is focused on create a unique list from a column. | Use before importing messy CSV headers. |
Test cases
| Test | Platform | Formula | Returns |
|---|---|---|---|
| Excel copy output | Excel | =UNIQUE(FILTER(A2:A100, A2:A100<>"")) | The output contains each nonblank value once. |
| Google Sheets copy output | Google Sheets | =IFERROR(UNIQUE(FILTER(A2:A100, A2:A100<>"")), "No values") | The output contains each nonblank value once. |
Related formulas
FAQ
What does the Unique List Formula do?
It supports this task: Create a unique list from a column. The example uses A2:A100, but you should replace the ranges and criteria with the cells in your own workbook.
Does the Unique List Formula work in Excel and Google Sheets?
Not exactly. This page shows a separate Google Sheets formula when the syntax differs.
What should I change before copying the formula?
Change the source ranges, criteria cells, and output range references so they match your sheet. Keep related ranges on the same rows unless the formula notes say otherwise.
Why does the cleanup result spill into nearby cells?
Dynamic array formulas expand into the cells they need. Keep the output area empty so the formula can spill.
Should blanks be included in this cleanup formula?
Most cleanup formulas on this site exclude blanks or include a blank guard. Adjust that only if blank values are meaningful in your audit.
Can hidden spaces affect duplicate or unique results?
Yes. Values that look identical can be different if one contains a leading, trailing, or nonbreaking space.