One simple way
Assume monthly figs are progressively entered in B2 across
In C2: =AVERAGE($B2:B2)*12
Copy C2 across to return desired yearly forecast

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P/s: Rather than here, post such questions in excel.worksheet.functions
which is a more appropriate and better attended newsgroup
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"JanSanM" wrote:
I am keeping a log of cases done per month, and need to annualize each month
to forecase yearly volume. I am looking for the way to build the formula to
Annualize.