Estimating HML payments for holding costst

[Devin Hughes]

Hey BP! This seems like a really elementary question that I probably learned at some point but, for the life of me, I can't find the answer. When analyzing a potential flip that I intend to use hard money to acquire, how do I determine the payments to that lender for holding costs? Is there a tool/calculator that you use or is it a basic formula? I can find mortgage payment calculators all over the place, but have had zero luck with this.

Thank you!