Anyone have a Portfolio Analysis Tool for 5 Year Forecast?

[Char Tovar]

I have been analyzing property by property to find deals and have picked up a couple. Now, I'd like to start looking at how many properties I will need based on what I have purchased and then forecast the difference (# of properties needed/cashflow) to meet my goals. Anyone aware of a tool/spreadsheet/etc. that does this in a simple format? I don't want to spend a lot of time on it, just looking for a rough order of magnitude. Any help would be much appreciated!