@Monica Gonzalez a paid memership to BP will unlock their tools/calculators.

Not calculating maintenance expense could end up being a nightmare.I always estimate (using either the 50%, 1% or square footage rule) the annual maintenance / first year of maintenance fees for a ALL rental property.

You said "don't do it for the money," but I'm sure money calculations were part of convincing you this would be a reasonable way to spend your time and money.

Quote from @Bonnie Griffin Kaake: Here is a simplified calculation that some may be interested in: ADU cost $200K, annual rental $21,600 ($1,800 per month) = almost 11% per year.

This calculation has probably now changed this year (versus a few years ago) when these services started cracking down on "sharing" which would affect STRs - I think its a big value-add to provide now versus in the past because of this

Upon sale, gains are taxed as long-term capital gains, calculated as the sale proceeds minus your adjusted basis (initial investment reduced by any return of capital).

Learn from this experience & do some simple calculations to find a good rental rate. $1200 at 1.5 months vacant will yield a greater annual EGI ($12,600) than $1350 with 3 months vacant ($12,150).

Highlights:* no prepay on 12 mo bridge* 6 months guaranteed interest on a 24 month bridgeThese are interest only loans and the DSCR calculation isn’t a factor in the lending decision.Compare the cost of your lower interest rate DSCR loan, including PPP versus what the bridge would cost at a higher interest rate and no or minimal PPP.PPP=pre payment penalty :)

Good afternoon,I am seeking help obtaining market data to calculate the cost of living and estimate rental expenses in the US. 

BiggerPockets also has a calculator to analyze deals, and I highly recommend you start this as soon as possible, even if you are not ready to buy.