The data on cap rates in my investing area are moving around but last year's and now are in the same league.So that seems like good back of the napkin analysis for me now.

Running a back of the napkin model of a rental in Austin, Taxes and Insurance would have to rise at 11%/yr  negate a rental rate increase of 3%/yr.

I will sometimes do a quick back of napkin calculation for certain areas however, such as median residential home price divided by average annual revenue provided by either Everbooked.com or AirDNA.com when quickly comparing two potential VR areas. 

The analysis can be substantial and if done too quickly may result in missed items or underestimation of costs.Once the opportunities for improvements have been identified it is necessary to perform a back of the napkin analysis to determine costs and if the price of the property will support the costs along with a projected lease up or sale.

Harvest permits or what has to happen to get one ( if needed at all)what species bring the most money.. along with harvest per MBF per acre so you can do napkin math.so for example.. in our area of the northwest we are soft woods..

It might be ok to do a quick "napkin" calculation but other than that, I don't find it useful.

Or a good ole school “Cash T” CPA trick IRS Agents use to sniff out people who try to pass information that doesn’t meet the scrutiny of a basic truth income formula you can do in 2 minutes on a napkin.

Your lease could be written in such a way that you have the right to force the remove of the pet for sanitary reasons or property damage.

This deal makes about as much sense as jumping out of a plain with a napkin for a parachute

So it looks like gross income is $2390/mo.Using the 2% rule as our back-of-the-napkin analysis, the "ideal" all-in price for a $2390/mo property would be $119,500.