Then I multiply the occupancy rate the rentalizer tells me but the total number of days in a year.

Best general rule of thumb that I've heard as far as expected ADU value is you multiply what you can rent it for and multiply it by 100.

As - is value - 420k Estimated Taxes (1% of property value) - $4,200Estimated Insurance - $2000Loan amount - $315,000 or 75% LTVMonthly Principal and interest at 7% = $2095.70Monthly Taxes & Insurance Escrow - $516.67Total Payment (PITI) - $2,612.37Then you take the monthly payment and multiply it by 1.1 or 1.2 (if going through a bank it could be as high as 1.4) $2,612.37 X 1.1 = $2,873.60 (this is where the actual rent/ market rent figure would need to be to support a 75% of ARV refi) This would force the lender to lower the LTV and if you owe more than that with the original loan you would be forced to sell or come out of pocket to complete the refinance. 

Usually investors want to see a property with some equity, multiply the arv by .75 and that's usually where they need to be at with the rehab 

Find the average cost.3) look for the average rents for 2/1 SFH in that neighborhood. 4) take the number from 3 and multiply by 12.5) take the number from 4 and divide by the number in 2.

Gross Rent Multiplier:  target?

If you’ve done your due diligence and ran the numbers before investing, your odds at success are greatly multiplied.

Multiply the Arv by .7 and subtract the rehab That’s what you need to be all in, simple 

Then get an average sq ft price, then multiply the sq ft price by your sq ft.

Non-recurring property expenses may be added back, if documented accordingly.If the property was in servicefor the entire tax year, the rental income must be averaged over 12 months; orfor less than the full year, the rental income must be averaged over the number of months that the borrower used the property as a rental unit.See Treatment of the Income (or Loss) below for further instructions.Lease Agreements or Form 1007 or Form 1025: When current lease agreements or market rents reported on Form 1007 or Form 1025 are used, the lender must calculate the rental income by multiplying the gross monthly rent(s) by 75%.