[Zeldark]

Sounds like the potential cost to the river would be a good thing to memorize.

We are risking a potential 3BB to win a potential 4.25BB. That provides us with 1.4:1 odds to call to showdown. If he doesn't fire on each street our odds go up.

1.625:1 if he doesn't fire on the river.
2.25:1 if he doesn't fire on the turn.
And the previously mentioned 3.5:1 if he doesn't fire on the flop.

Then there's also implied odds which aren't factored in.