Ok, thanks for the responses... I'm trying not to be dense here...

Let me do the numbers myself here to see how I stack up to what you said...

Antes in the pot = 25 x 5 = 125 chips
SB = 150
BB = 300
So pot starts as 575 chips.

Ok, so now the SB raises another 633, making the pot 1208.

It costs me 483 to call.

1208/483 = 2.5 to 1 for pot odds, as Robb clarified, so that is my number. Ok, I see that 5 to 2 is the same as 2.5 to one, but where does the 2/7 equity come from?

The way I see it, I have 6 outs... hitting a J or 6. There is no straight draw for me pre-flop, no flush draw, so I have 6 cards out of 5 remaining, roughly 12% of the deck, with at least two opportunities that makes it about 24%?

So I have about a 24% chance, with about 5 to 2 pot odds, which I calculate to 40% needed to call... or am I missing something critical here?