For FHA it is currently always 0.85%.For conventional, it can be as low as 0.41% and as high as 1.5%.Multiply the monthly dollar amount you are quoted by 12 and divide by loan amount to back into what your mortgage insurance effective interest rate is, assuming you are working with one of the 95% of loan officers that will refuse to ever outright tell you this number directly.

For myself it's just a multiplier, 1 MN deal is like 2/3 OH deals.

I narrowed it down to multiplying the Price to pay for the house and multiply it by .007%.Assuming a $100,000 purchase Price for the house x .007% = a $700 monthly mortgage paymentDoes this seem accurate as far as a Formula goes to figure it out?

Multiply that $4.8 million by 6-8 because of that many times more doors and you see the wealth generation.Many investors will just keep flipping to larger and larger complexes to get there.

@Jim PellerinThank you for your response Jim and also thank you for the link.I'm new in the commercial world and what I meant is, I'm looking for the formulas that technically helps me to calculate all the necessary numbers, like Gross Rent Multiplier, Cash Flow, Gross Scheduled Income, Operating Income / Expenses, Cap Rate, Equity Build Up Rate, etc.When I get the rent roll and income statement about a property with all the numbers in it, I need to calculate these important things to see if I should moving forward or not.

I'm looking for multiply ways to market this quickly.

But that should help to narrow in on the numbers when doing analysis of properties in our area.For a property located in Sevier County (by far the majority of the STR properties), it is assessed by taking the total tax appraised value, multiplying it by 25%, then taking that value and multiplying it by 1.48%.

BiggerPockets Rental Property CalculatorMcKellar AveMonthly Income: Monthly Expenses: Monthly Cash Flow: Pro Forma Cap Rate:$950.00 $658.43 $291.57 8.99%NOI Total Cash Needed Cash on Cash ROI Purchase Cap Rate$7,638.00 $14,025.00 24.95% 8.99%Property InformationPurchase Price: $85,000.00Purchase Closing Costs: $1,275.00Estimated Repair Costs: $0.00Total Cost of Project: $86,275.00After Repair ValueDown Payment: $12,750.00Loan Amount: $72,250.00Loan Points: -Loan Fees: $0.00Amortized Over: 30 yearsLoan Interest Rate: 4.000%Monthly P&I: $344.93IncomeRent $950.00Total $950.00ExpensesElectricity $0.00 Gas $0.00Water & sewer $0.00 HOA fees $0.00Garbage $0.00 Custom expensesVacancy $95.00 Maintenance $47.50Management $95.00 Insurance $41.00Property Taxes $35.00 Mortgage Payment $344.93Total $658.43Buy & Hold Analysis - 01/09/23 10:05:27PM Page 1 of 3Total Initial Equity: -$72,250.00Gross Rent Multiplier: 7.46Income-Expense Ratio (2% Rule): 1.10%Typical Cap Rate: 8.99% Debt Coverage Ratio: 1.85ARV based on Cap Rate: $85,000.0050% Rule Cash Flow EstimatesTotal Monthly Income: $950.00x50% for Expenses: $475.00Monthly Payment/Interest Payment: $344.93Total Monthly Cash Flow using 50% Rule: $130.07Analysis Over TimeAnnual GrowthAssumptions2% 2% 2%Expenses Income Property ValueYear 1 Year 2 Year 5 Year 10 Year 15 Year 20 Year 30Total Annual Income $11,628 $11,861 $12,587 $13,897 $15,343 $16,940 $20,650Total Annual Expenses $7,976 $8,053 $8,293 $8,725 $9,202 $9,729 $10,954Total Annual Cashflow $3,652 $3,807 $4,294 $5,171 $6,141 $7,210 $9,696Cash on Cash ROI 26.04% 27.15% 30.62% 36.87% 43.78% 51.41% 69.13%Property Value $86,700 $88,434 $93,847 $103,615 $114,399 $126,306 $153,966Equity $15,722 $18,781 $28,499 $46,693 $67,767 $92,236 $153,966Loan Balance $70,978 $69,653 $65,348 $56,921 $46,632 $34,069 $0Total Profit if Sold $5,349 $12,214 $34,321 $76,583 $126,383 $184,723 $331,821Annualized Total Return 38% 37% 28% 21% 17% 14% 11%

If they're pulling the revenue data from AirDNA then it is including cleaning fees in the revenue, and hence cleaning will need to be subtracted back out as an expense.I think this is something that trips a lot of people up when underwriting.AirDNA total revenue DOES include cleaning fees.AirDNA adr does NOT include cleaning fees.This is why when you multiply ADR * Occupancy on AirDNA you get a number that is less than the total revenue.So if using the total revenue number then cleaning does need to be subtracted as an expense. 

Standard multipliers?