Thanks very much to T. Valko and Max for taking the time to help me out.

Welcome. Please go back and press the Yes* buttons in all responses which help
*like the ones below, from where you're reading this

I want to calculate the percentage of the "C"s in
column A, compared to ALL of column A

Assuming no column header in A1, then:
=COUNTIF(A:A,"C")/COUNTA(A:A)
Format as percentage

If there is a column header in A1, adjust it like this:
=COUNTIF(A:A,"C")/(COUNTA(A:A)-1)
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Max
Singapore
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xdemechanik
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