Help with calculation of customer retention rate in Excel file (Cohort analysis)

Hi all,

Please help me to calculate the retentaion rate of customer over months

For example,
- In January I have 4 new customer.
- In February, 3 out of 4 continue to purchase my product > retention rate is 3/4 = 75%.
- In July, 1 out of 4 purchase my product > retention rate is 1/4 = 25%

I did a example below. Please help me with the rest of the table

Thank you so much

Examples Excel.JPG

Please try E25 copy over the table

=COUNTIFS($C$4:$C$20,$B25,E$4:E$20,">0")/COUNTIFS($C$4:$C$20,$B25)

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