## How to highlight duplicate values

#### Table of Contents

## 1. How to highlight duplicate values

The picture above shows duplicate values in column B, only the second or more duplicates are colored and easily identified.

To sort all duplicates to the bottom of the list for removal, creating a unique distinct list. See this blog post

How to create a unique list using conditional formatting in excel 2007

To color duplicate cells I use conditional formatting in excel. The conditional formatting formula in B3:B11:

### 1.1 Explaining CF formula

#### Step 1 - Expanding cell reference

The first argument in the COUNTIF function expands as the CF moves to cells below, this makes it easy to spot duplicate values as their count is 2 or larger.

Cell |
First argument |

B3 | $B3:$B$3 |

B4 | $B4:$B$3 |

B5 | $B5:$B$3 |

#### Step 2 - Absolute cell reference

The second argument changes to the current cell.

Cell |
Second argument |

B3 | B3 |

B4 | B4 |

B5 | B5 |

#### Step 3 - Count current value in expanding cell range

COUNTIF($B3:$B$3, B3)

becomes

COUNTIF("VV", "VV")

and returns 1

Cell |
COUNTIF |
Evaluates to |
Result |

B3 | COUNTIF($B3:$B$3, B3) | COUNTIF("VV", "VV") | 1 |

B4 | COUNTIF($B4:$B$3, B4) | COUNTIF({"VV","AA"}, "AA") | 1 |

B5 | COUNTIF($B5:$B$3, B5) | COUNTIF({"VV","AA","DD"}, "DD") | 1 |

#### Step 4 - Check if value is larger than 1

COUNTIF($B3:$B$3, B3)>1

becomes

1>1

and returns FALSE. Cell B3 is not highlighted.

**1.2 How to highlight duplicate values occurring the second time or more using conditional formatting in Excel**

- Select the range (B3:B10)
- Press with left mouse button on the "Home" tab on the ribbon
- Press with left mouse button on "Conditional formatting"
- Press with left mouse button on "New rule..."
- Press with left mouse button on "Use a formula to determine which cells to format"
- Press with left mouse button on "Format values where this formula is true" window.
- Type COUNTIF($B3:$B$3, $B3)>1
- Press with left mouse button on "Format" button
- Go to tab "Fill"
- Pick a color
- Press with left mouse button on OK button
- Press with left mouse button on OK button again to return to Excel

### 1.3 Get Excel example file

highlight-duplicates-using-conditional-formatting.xls

(Excel 97-2003 Workbook *.xls)

## 2. Highlight the smallest duplicate number

**Question:** How do I highlight the smallest duplicate value in a column using conditional formatting?

**Answer:**

Conditional formatting formula in A2:

**2.1 How to apply conditional formatting**

- Select cell range
- Go to "Home" tab
- Press with left mouse button on Conditional formatting
- Press with left mouse button on "New Rule.."
- Press with left mouse button on "Use a formula to determine what cells to format"
- Copy the above conditional formatting formula to "Format values where this formula is true:"
- Press with left mouse button on Format button
- Select a formatting you like.
- Press with left mouse button on OK
- Press with left mouse button on OK

### 2.2 Explaining CF formula in cell A2

#### Step 1 - Identify duplicates

The COUNTIF function counts values based on a condition or criteria.

COUNTIF($A$2:$A$11, $A$2:$A$11)>1

becomes

COUNTIF({6;4;6;12;18;12;10;3;11;8}, {6;4;6;12;18;12;10;3;11;8})>1

becomes

{2;1;2;2;1;2;1;1;1;1}>1

and returns

{TRUE; FALSE; TRUE; TRUE; FALSE; TRUE; FALSE; FALSE; FALSE; FALSE}.

#### Step 2 - Extract duplicate numbers

The IF function uses a logical expression in order to determine which argument to return.

IF(COUNTIF($A$2:$A$11, $A$2:$A$11)>1, $A$2:$A$11, "")

becomes

IF({TRUE; FALSE; TRUE; TRUE; FALSE; TRUE; FALSE; FALSE; FALSE; FALSE}, $A$2:$A$11, "")

becomes

IF({TRUE; FALSE; TRUE; TRUE; FALSE; TRUE; FALSE; FALSE; FALSE; FALSE}, {6;4;6;12;18;12;10;3;11;8}, "")

and returns

{6;"";6;12;"";12;"";"";"";""}.

#### Step 3 - Identify the smallest number in array

The MIN function extracts the minimum value in a cell range or array.

MIN(IF(COUNTIF($A$2:$A$11, $A$2:$A$11)>1, $A$2:$A$11, ""))

becomes

MIN({6;"";6;12;"";12;"";"";"";""})

and returns 6.

#### Step 4 - Compare smallest number to current cell

MIN(IF(COUNTIF($A$2:$A$11, $A$2:$A$11)>1, $A$2:$A$11, ""))=A2

becomes

6=A2

becomes

6=6

and returns TRUE. Cell A2 is highlighted.

### Get Excel *.xls file

### Cf duplicates category

This article shows you how to easily identify duplicate rows or records in a list. What's on this webpage Conditional […]

The image above demonstrates a conditional formatting formula applied to an Excel Table containing random data. The Excel Table has […]

The image above demonstrates a conditional formatting formula that highlights duplicate items based on date. The first instance is not highlighted, […]

The following conditional formula highlights only the second instance or more of a value in a cell range. Conditional formatting […]

Question: My scenario is tracking employees who complete online training. I capture their name, id, class taken, and date. Any […]

This article describes how to highlight duplicate records arranged into a column each, if you are looking for records entered […]

Question: How do I highlight the smallest duplicate value in a column using conditional formatting? Answer: Conditional formatting formula in […]

Question: I need to delete duplicates in two different columns together. How do I highlight the second or more duplicates […]

### Conditional formatting category

The image above demonstrates a conditional formatting formula that colors a record if there is at least one record that […]

This article explains how to count cells highlighted with Conditional Formatting (CF). The image above shows data in cell range […]

adam asks: Hi, I have a situation where I want to count if this value is duplicate and if it […]

Question: How do I highlight dates that meet criteria using conditional formatting? Table of contents Highlight values in a column […]

This post demonstrates how to highlight records with the closest value to a criterion, you can also choose to highlight […]

The image above shows rows highlighted based on value in column C being the largest or smallest in that particular […]

This article shows you how to easily identify duplicate rows or records in a list. What's on this webpage Conditional […]

The image above demonstrates a conditional formatting formula applied to an Excel Table containing random data. The Excel Table has […]

Here is how to highlight every other row using conditional formatting. Conditional formatting formula: =ISEVEN(ROW())*OR($B3:$D3<>"") Alternative CF formula: =EVEN(ROW())=ROW() This […]

Question: I have a list that I keep adding rows to. How do i create a border that expands as […]

The image above shows you how to highlight rows with multiple criteria using OR logic. The criteria are found in […]

In this article, I will demonstrate how to search a table using conditional formatting. The criteria highlight matching column and […]

Today I am going to show you how to quickly compare two tables using Conditional Formatting (CF). I am going […]

The image above demonstrates a conditional formatting formula that highlights duplicate items based on date. The first instance is not highlighted, […]

A conditional formatting formula highlights values in column B that also exist in column D. =COUNTIF($D$3:$D$7,B3) The same thing happens […]

In this post I am going to try to explain formula basics in conditional formatting. It is really good if […]

The image above shows conditional formatting highlighting unique distinct values, duplicates are not highlighted. Conditional Formatting Formula: =COUNTIF($B$3:B3, B3)=1 The […]

This article demonstrates how to apply different cell formatting to a cell range based on a Drop Down list, column […]

In this blog post I will demonstrate a conditional formatting formula that will highlight common records in two lists. The […]

The image above demonstrates a conditional formatting formula that highlights records that only exist in one table. There are two […]

## Functions in this article

More than 1300 Excel formulas

## Conditional Formatting categories

## Excel categories

### 2 Responses to “How to highlight duplicate values”

### Leave a Reply

### How to comment

**How to add a formula to your comment**

<code>Insert your formula here.</code>

**Convert less than and larger than signs**

Use html character entities instead of less than and larger than signs.

< becomes < and > becomes >

**How to add VBA code to your comment**

[vb 1="vbnet" language=","]

Put your VBA code here.

[/vb]

**How to add a picture to your comment:**

Upload picture to postimage.org or imgur

Paste image link to your comment.

**Contact Oscar**

You can contact me through this contact form

[…] has some incredible tools for highlighting cells, rows, dates, comparing data and even series in line charts. A technique using the secondary […]

[…] Highlight duplicates values […]