---
title: "Find duplicates | PracticeExcel"
description: "Practice conditional formatting that finds duplicates in Excel. Highlight rows with COUNTIF and get the formula checked right away."
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# **Find duplicates**

**Premium**

Highlight the whole row when the customer ID appears more than once in A2:A6. In D2, write the rule with COUNTIF. Lock the whole range and the column in A2.

D2fx

|  | A | B | C | D | E | F |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | Customer ID | Name | City | Duplicate? |  | |
| 2 | 1001 | Anne Holm | Aarhus |  |  | |
| 3 | 1002 | Jonas Berg | Odense |  |  | |
| 4 | 1001 | Anne Holm | Aarhus |  |  | |
| 5 | 1003 | Mette Lund | Vejle |  |  | |
| 6 | 1004 | Ali Khan | Aalborg |  |  | |
| 7 |  |  |  |  |  | |
| 8 |  |  |  |  |  | |

**Premium lesson**

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Next with premium:**Drop-down lists and data validation****COUNTIF**

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