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How to count consecutive duplicates in Excel?

Author: Sun Last Modified: 2020-07-21

To count the duplicates in an Excel column may be easy for you, but have you ever tried to count the consecutive duplicates yet? In other words, it will count continuous duplicates and recount it from 1 if there is a break between the duplicates as below screenshot shown.
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Count consecutive duplicates with formula

arrow blue right bubble Count consecutive duplicates with formula

To count consecutive duplicates, just need to apply a simple formula.

1. Select an adjacent cell, B1 for instance, enter 1. See screenshot:
doc count consecutive duplicates 2

2. In the next cell below 1, B2 for instance, enter this formula =IF(A2=A1,B1+1,1), then drag autofill handle down to the cells to apply this formula. See screenshot:
doc count consecutive duplicates 3

Note: in the formula, A1 and A2 is the first two values in the list you want to count consecutive duplicates, B1 is the cell you enter number 1 in the first step, you can change them as you need.

Tip.If you want to quickly select and count the duplicates or unique values in a list, please try to use the Kutools for Excel’s Select Duplicate & Unique Cells as shown in the following screenshot. It’s full function without limitation in 30 days, please download and have a free trial now.
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thank you. It helped me. I looked for the solution in regex and did not find
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