[Sevenfold]

Simply calculate the pot odds at the last card (all bets in the pot to this point, or simply the total size of pot). This is exact.

Say the pot has $5 and it cost you $1 to call. You must win this pot 1 time in 6 to break even (lose $1 five times, win $5 once).

So now you have to figure out if you think your hand will win 1 in 6 or better.

So the pot determines the odds, and then you have to use your judgement.

$10 pot, $1 to call, need to win 1 out of 11.

$3 pot, $1 call, need to win 1 out of 4, etc.

Good luck.