I'm trying to find a formula (ideally) in Excel that will allow me to take a
constant weekly sales growth rate (based on 2006 actuals), and apply it to
the current week's actual sales amount...resulting in a 2007 year-end sales
estimate. Is there a way to do this (plug-in, etc) WITHOUT having to
manually create a separate tab to calculate, then sum, each projected week's
actual?

On Feb 27, 1:20 pm, bobmount
wrote:
I'm trying to find a formula (ideally) in Excel that will allow me to take a
constant weekly sales growth rate (based on 2006 actuals), and apply it to
the current week's actual sales amount...resulting in a 2007 year-end sales
estimate.

Giving you want I think you asked for:

=sum(C1:C8) + fv(A1, 52 - 8, 0, -C8)

where C1:C8 are the actual weekly sales amounts for the first 8 weeks
of 2007, and A1 is the average weekly sales growth rate based on 2006
actuals.

That is certainly not the way that I would estimate year-end sales.
So perhaps I misunderstand you. If so, please clarify your question.

Thanks, Joe...And yes--I realize there are much more sophisticated ways of
projecting sales, but I'm actually doing this for a friend who claims that
this over-simplified way of projecting sales is, in fact, what he's being
asked to do...at this stage.

In fact, he's being GIVEN last year's weekly average sales increase (0.40
%), and asked to apply it to the current year's sales totals to extrapolate
the remaining 42 weeks of 2007 (cell A1, in your example).

Thanks again for the help!

"joeu2004" wrote:

On Feb 27, 1:20 pm, bobmount
wrote:
I'm trying to find a formula (ideally) in Excel that will allow me to take a
constant weekly sales growth rate (based on 2006 actuals), and apply it to
the current week's actual sales amount...resulting in a 2007 year-end sales
estimate.

Giving you want I think you asked for:

=sum(C1:C8) + fv(A1, 52 - 8, 0, -C8)

where C1:C8 are the actual weekly sales amounts for the first 8 weeks
of 2007, and A1 is the average weekly sales growth rate based on 2006
actuals.

That is certainly not the way that I would estimate year-end sales.
So perhaps I misunderstand you. If so, please clarify your question.