If the size of the pot is xbb and it's 1bb to call.
In order to decide whether or not to call you have to decide if the chance of you being ahead is better than 1/xbb
If it is you call if not you fold.
For example if the pot is 200 and it's 10 to call then if you think there is a 10/200 or 1/20 chance of you being ahead then you call.
That's if it's treated as a pure ev decision, in tournies it can be a bit more complex.
To be honest if I'm getting much more than 10 to 1 on any call, I figure there's at least that chance the other guy is flat out bluffing
and call and long the long run take care of it.