Playing more hands, experience, is the best tool, imop. I take notes on players technics. For example, if a player is aggressive, I’ll note that. I only make that decision after playing multiple hands against this kind of player. It’s helped me more times than not. So, players that do unusual things, I take notes on. Just my was of keeping track of their tendencies. Other than that, I’m too slow to use some kind of calculator to analyze the table.