you can use poker tracker to keep an eye on it for you, its an important thing in table selection.. you want a high players per flop %, which would suggest a loose table. If you have a low % then the table is probably going to be a bit of a drag to play at.. you can work it out from watching though.. if theres lots of preflop raising i dont hang around to much.. for full ring i want to have lots of limpers that are prepared to call preflop if i raise.