BiggerPockets does have a free rent estimator for u; to eight times.

Not enough here to tell for sure.Perhaps your estimate of $300k was off?

Or, are you talking about estimating rehab cost for your own real estate investing? 

Okay so each unit would rent for $700 that a total income of $1400.mortgage payment estimate - $601 unsung FHA or conventional financing (still not sure) with 3% interest rate and 5% down potentially Repairs and maintenance - 8% / $112Vacancy - 8% / $112Cap ex - 9% / $126Management fees - 10% / $140Taxes - $100 monthlyInsurance - $60 monthlyTotal expenses - $1251Total income - $1400So I’m estimating on cash flowing $149 a month witch would be a 15% ROIIf I only rented one unit out and lived in the other then my rental income would a total of $700 instead of $1400.

The estimated monthly cashflow is approximately $350 which is 17% cash on cash ROI.

Before doing refinancing, I ask my broker to estimate from her computer to see if it's worth it for me.

If you can get an electrician out there to check it out they should be able to give you a much better estimate and idea of the process.Best of luck!

Next you will need to determine how much work needs to be completed on the property and develop a cost estimate to conduct those repairs.

What about the best/most accurate tools for estimated monthly rental cost?

You can also look for networking groups on sites like Meetup.com.The tough part, in my estimation, is going to be differentiating yourself from the people who say they have deals but are really just faking it.