Has anyone used the new Bigger Pockets Rental Property Calculator?

I calculate my mo mortgage payment plus tax/ins would be 1050$ with a loan around 100k @4.5 to 4.75%Or should I just pay down the rental I currently own?

To my surprise the calculators have changed!!! 

The advantages of building new smaller properties is they can be built quicker and leased up to full occupancy faster than larger properties, they are a little easier to get approval in certain areas and site work, stormwater and parking development costs can be exponentially lower per unit or per sqft as compared to larger properties requiring significant site improvements.You need to work the numbers backwards starting with estimated construction and development costs, calculate estimated GPR, back out standard operating cost assumptions of 45%, which is average for most new construction buildings of this size, to get to the NOI to determine if the project works.

@Carlos Castañon you might dbl check how you are calculating your numbers... debt service isnt included when calculating NOI or cap rates  

Does anyone use the BP calculators for rehabs/flips?

Third, where in this calculation are you including the yearly cost for taxes, insurance, vacancy, CAPEX, etc...?

View report*This link comes directly from our calculators, based on information input by the member who posted.

Is there a book that will teach me how to calculate the costs of repairing a house.

Or am I able to count rental income in my DTI calculation?