I have a column in my Google Spreadsheet which contains either OK or NOK (acceptance testing).

How can I calculate the percentage for how often OK appears compared to NOK.

2 Answers 2


How about:

= COUNTIF( A1:A; "OK" ) / COUNTA( A1:A )

A1:A defining the column in which the OK/NOK values are defined. If you have more values than OK and NOK, use this:

= COUNTIF( A1:A; "OK" ) / ( COUNTIF( A1:A; "OK" ) + COUNTIF( A1:A; "NOK" ) )
  • The second formula is perfect, thanks.
    – GG.
    Feb 2, 2012 at 14:47

Use this excel formula:

Assuming Column A has list of entries


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