If your rents are strong and the Loan Officer calculated your rental income well, you should not have an issue qualifying for a HELOC on a primary. 

4) Is there any good way to "calculate" the new appraised value ahead of time to know what to fix/rehab?

@Peter, @Bill B.laid out the gain calculations very well. 

Working in construction can give you a leg up here- you can probably eyeball  a fixer upper and get some numbers going mentally to calculate the scale of project you are taking on. 3.

Understand the fees involved and calculate the total cost for an entire year of management so you can compare the different managers.

I learned how to calculate my yield on loans that I cashed out as an annualized return vs how much I made in dollars or percentage over what I paid.

Around here I normally calculate about a 30% overhead when evaluating a property, but I’m pretty sure I’m gonna have to bump to 40% to cover the increased insurance cost there.I’ve seen a fair number of SFRs that look like they would provide 8% gross using the only tools I have available over here, which is rentometer and Zillow.

Hey all, does anyone know of a good deal analysis calculator for Canada?

I am calculating 20% from the net profit (we are in CO)... including AFTER holding costs and reimbursing our own $ that we also used to fund the flip.  

My offers are based on market analysis, and calculated based on the maximum number I can offer and still make either my desired cf and/or profit on that property.