I use very conservative values (10% Capex, repairs, vacancy rates, etc) I compared it with a couple of other online calculators and it gave me similar results. 

It supposedly lists typical cap rates, vacancy rates, average financing terms etc for commercial properties.

View report*This link comes directly from our calculators, based on information input by the member who posted.Up and down duplex, the property is located 5 minutes from a University, middle school, and there is talk about building another school 5 minutes away No vacancies in the last 2 and a half years according to the property manager, new roof last year, the siding looks like it's in good shape.

Hey @Logan House, you are likely over estimating income (rent rates) and/or underestimating costs (are you accounting for repairs, cap ex, insurance, vacancy, pm company?).

I feel this will be a safe choice because the first one will be generating about 1200/m and facing any vacancies or unexpected incidents that could be very helpful.

Rents in my neighborhood go for 1600-1900My target range for the bigger house would be a max of 330k and I think could rent the bottom out for 800-1000 per month.Scenario 1: I rent out my old house, I factored in taxes,  insurance, 5% for vacancies and 5% for repairs and I'm estimating $150/month cash flow.My payments on the new place would be about $1750 - 900 from the tenant = $850/ month. 

But using the 50% rule of thumb as a conservative start to estimate capex/vacancy/repairs, they did not technicaly cash flow based on .5 x gross rent - PITI.I assume this is because with a brand new product, maintenance and capex will be really low for a long time am I right?

Shop around.I like 8% vacancy for my underwriting.

I also believe your vacancy to be low at 90.00 a month it would take a years worth of saving to cover one months PITI.

We’ve seen that vacancy in the short term rental market doesn’t hit the market uniformly.