Mortgage Qualification Calculator with Rental Income

[Michael Osborne]

I am planning to buy a new primary residence in about a year. At the time I will have 3 rental properties that have each been rented for 2+ years. I am trying to determine how large of a mortgage I would qualify for. Is there a calculator that would account for this?

Properties rent for $2350 (mortgage $2200), $2100 (mortgage $1700), and $750( no mortgage but tax and insurance is about $150 a month). Is the calculation as simple as taking 75% of gross rent and then subtracting that to determine the monthly debt payment? So $3900 minus $3900, then I would just use my household W2 income of approximately $170k to determine mortgage limit.