They provide several financial spreadsheets, calculators, and other document resources as well.In addition to their Academy, they are more well known for their turnkey business. 

The income (or less) will be calculated off step 1 and step 2 of this form: https://content.enactmi.com/documents/calculators/Form1038.C...

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

Upfront expenses and monthly payments must be considered when calculating the return on your investment.EXAMPLEYou cash out $100,000 of your equity and use this as a down payment on a $400,000 investment property.

Seller Financing:Your original loan was $355,000, with a current balance of $310,000 at a fixed 3.5% APR for 30 years.Monthly payment on your original loan (assuming standard 30-year fixed terms) is approximately $1,593.Under seller financing, the buyer's monthly payment for a $400,000 loan at 4% interest (calculated as a 30-year loan but with a 5-year balloon payment) is approximately $1,909.Monthly Cash Flow Spread:The difference between your current mortgage payment ($1,593) and the buyer's payment to you ($1,909) is $316.

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

Join Biggerpockets Pro for the $400/year and use their calculators to do deal analysis.

I would like to find out what are some good websites with calculators you use to calculate rebuild cost, so I have a better idea which replacement value is reasonable.

Upfront expenses and monthly payments must be considered when calculating the return on your investment.EXAMPLEYou cash out $100,000 of your equity and use this as a down payment on a $400,000 investment property.

Take a look at the return on equity calculation.