Hi,

Try something like this array formula:

=AVERAGE(IF(MOD(A1:A20000,48)=1,A1:A20000))
adjust to suit.... the 1 represents the row of your first data cell to
average, so if your data starts on row 3 then change the 1 to a 3, also this
is an array formula so commit with Ctrl+Shift+Enter

HTH
Jean-Guy


"akoskelo" wrote:

Hi. I have a huge spreadsheet (~20,000 rows). I need to average every 48 rows
into one value. Is there a quick and easy way to do this without scrolling
through all 20,000 rows and copy-pasting the "average" function every 48th
row?

Thank you.