Rental Cashflow/Profit Worksheet?

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I saw in a book sometime in the past that had a worksheet to help determine if a rental would be profitable or not. I cant seem to find it.

Does anyone have a worksheet that they use to determine if the numbers work out on a deal or not. I looking at a property but not sure how much to offer for it. I have done some rental research, but need a tool to figure the numbers, as I do not want to have negative cashflow.

Thanks,
Mike