Ok so I've been playing a ton of poker for the last year or so. NL holdem tournaments mainly. I normally go by the 2 4 rule for calculating odds, but I can't find the answer to this one problem. What are my outs/odds of hitting the backdoor flush? Lately I've come into alot of situations where I hit middle pair on the flop with a backdoor flush draw, and can't decide whether or not I'm getting value out of calling, or if I should just lay it down. If it's a pot bet or larger bet, I obviously fold. Is it a leak to be calling bets with these hands looking to improve my hand into a flush, or maybe trips?