How to Forecast Workload & Resource or Manpower Needs?

[PSPM]

Hi Group,

I'm planning a project, establishing a total number of deliverables - Let's say - 300, each averaging 15 days to work. I have the following but for whatever reasons, my calculations seem to be (little bit) off:

If I have a project duration: 08/20/12 –to– 12/21/12 (Target Date) with the following parameters:

Typical Work Week (Days) 5 (Cell N3)
Approx. Weeks 18 (Cell N4)
Avail. Workdays 87 (Cell N5)
Typical Work Hours 8 (Cell N6)

My Total Deliverables: 300 (Cell D10)

Estimated Duration to Complete: 15 days (Cell D12)

To Met Project Target Date (function) =ROUND(D10/$N$4,0) (Cell D14)
-- This is resulting with 5 days, which seem to be a low number.


-- Whatever this foretasted result is, how would I then determine the number of workers would be needed to work the project - Assuming 40 hr. week.

Thanks for the assistance or clarifications.....

PSDM

 

[PSPM]

Hi Group,

Here's the attachment to review.

Thanks

PSDM

 

[LiteYear]

Not sure what the issue is here... D14 is just D10 divided by N4. If you have x deliverables and y weeks to deliver them then you need to deliver x/y deliverables per week.

Using your numbers you should get 300/18 = 17 in D14. I guess you're getting 5 because the cell hasn't been updated. Check Formulas -> Calculation -> Calculate Now in the Excel ribbon menu.

When I opened your spreadsheet the numbers were 244/18 = 14, which is correct.

 

[LiteYear]

Oops, my posts have been disappearing this morning so I didn't see you second post when I replied.

In the new spreadsheet the formula for D14 is now =ROUND((M3/D9)*M4,0). So I guess it's giving the wrong answer because it's the wrong formula. Would seem pretty straight-forward...