Where would you get accurate NOI calculations from? 

GRM does not account for any of these variables.Yes, GRM can be used as a quick rule of thumb, but net operating income (NOI) which does account for high expenses is much more accurate indicator, imho.    

(get accurate comps in other words).

There are so many variables involved in accurately answering that question.

o vetted licensed and insured contractorso Upfront prices are real and accurate (custom, real, accurate, instantly, and lower than the market)o No risk to book projectso HUMAN concierge, for free.• Benefits for contractorso No upfront expenseso instant automatic quoting (quote a job without seeing it in person)o Less time driving around giving estimateso No wasting time for tire kickerso cost per acquisition modelo free leads

I'm trying to set a goal for what kind of cash-flow I need to accurately replace my income from my 9-5 and I want to be sure I'm considering the whole picture.Round numbers...If I'd like to replace a $5000 monthly salary, and can comfortably bring in $500/door after PITI, maintenance, etc.

Hello BP......what is the most accurate way to determine if a deal is a deal when not using the BP calculator

It's great that you are going into it with contractor experience, there's a lot of times I wish I could better advise clients on accurate costs to many repairs.

Are these Realiable for getting Current and Accurate phone numbers ?

Being from here helped to give me a sense of what neighborhoods I wanted to invest in but I still had to spend time learning how to accurately value property.