Answer

Counting duplicates in Excel means identifying values that appear more than once in a range and determining how many occurrences exist. A duplicate value is any value that repeats in the dataset.

How to count how many times each value appears

Excel counts occurrences with the COUNTIF function.

Formula to count occurrences of each value

Place this formula next to the first cell of your list to count how many times that value appears in the entire column:

$=COUNTIF(A:A,A1)$

This formula checks how many times the value in A1 appears in column A.

How to count the total number of duplicate entries

The total number of duplicates equals the sum of all values that appear more than once.

Formula to count total duplicates (excluding first occurrences)

Place this in any empty cell:

$=SUMPRODUCT((COUNTIF(A:A,A:A)>1)\ast 1)$

This formula returns the total number of entries that occur at least twice.

How to count only the unique duplicate values

Unique duplicate values are values that repeat but are counted only once per value.

Formula to count unique duplicate items

Use:

$=SUM(--(FREQUENCY(MATCH(A:A,A:A,0),MATCH(A:A,A:A,0))>1))$

Excel counts how many distinct values appear more than once.

How to highlight duplicates before counting them

Highlighting duplicates helps confirm your results visually.

Steps to highlight duplicates

1. Select the range.

2. Open Home > Conditional Formatting.

3. Select Highlight Cells Rules.

4. Select Duplicate Values.

5. Choose the formatting style.

6. Confirm with OK.

Windows and Mac use the same steps for this feature.

How to remove duplicates after counting them

Removal gives you a clean list.

Steps to remove duplicates

1. Select the dataset.

2. Open Data tab.

3. Select Remove Duplicates.

4. Choose the columns for checking.

5. Confirm with OK.

The feature keeps the first occurrence and deletes the rest.

How to count duplicates with multiple conditions

Excel counts duplicates with conditions using COUNTIFS.

Example formula

$=COUNTIFS(A:A,A1,B:B,B1)$

The result returns how many times the combination of A1 and B1 appears.

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