How to calculate net profits when analyzing a property

[Sparkle Carlock]

I know this may be a silly question, esp. since there are calculators that do could this for me.....  BUT.. I don't have full access yet to them. So I'm curious... I would like to learn how to analyze a deal better off the top of my head. More specifically, when strategizing to fix/flip a property, how can I be better at figuring out how much closing costs, seller/buyer fees, interests, etc., thus close to accurately estimating my  take-home profits? Any helpful advice would be appreciated ;-)