My formula seems to be:Low debt (50/50?)

There is no formula for this, of course.

I now have some workable formulas now though and have exercised some analytic muscles.

Figure out an average for all utilities and then split it based on square footage, number of occupants, or whatever formula you decide on.

The greatest tool in the REI arsenal is their ability to understand the formula...not just the answer. 

I have house hacked twice now.I always use these 6 formulas when doing basic numbers on a property.The 1% rule- example is a $100,000 House should rent for around $1,000 per monthThe 50% rule- 50% of the gross rents of the property will go towards expenses on the property that don’t include principal and interest payment.Gross rent multiplier- similar to a P/E ratio where you take the purchase price and divide by the gross rents for the property Cap rate- tells us what a property will produce after expenses.

It takes 10 minutes to set, along with formulas/stats.

As a rule a riser and tread formula works like this.

. $300-$1000kUtilitites: look at your own utility billThere isn't a magic formula that tells any of us exactly what these items will cost.

It will also tell you How many rolls of drywall tape it will take to do the job.How many pounds of drywall screws or nails and their size.How many pails of Joint Compound you will need to finish the project.and all the tools you will need as well.Bonus- there is a free downloadable PDF as well with all kinds formula tables as to help make things easier.