FHA 203k on a multifamily unit - how much can I afford

[Colin Alsheimer]

Looking at purchasing a multi-family (2-4 unit) property with an FHA 203k loan, then fixing up and renting to professionals while living in one.

My wife and I have been pre-approved for a good sum, but how do I figure out what the monthly mortgage cost will be at various price points? Not seeing any good online calculators like where would be with single family units.