How to figure out what my cash flow is?

[David Lee]

I have 4 property's that I rent out and I have 2 that I partner out with my dad. Most of them pretty much fell into our lap. I have never figured out how to figure out what my cash flow would be. I always thought if the payment was $200.00 and I rented it out for $500.00 my cash flow was $300.00. From what I have been reading this is wrong. Can anyone help and shed a light on it for me.