What percentage of the time am I ahead here?

[esbesb]

How often am I ahead here?

6-handed 2-4 NL on party. I am UTG with KK. I raise to 16. I get one caller in MP and the Button calls. SB and BB fold. Three to the flop, $54 in the pot.

Flop comes 2 4 5 rainbow. I bet the pot -- $54. MP folds. Button raises to $108.

I don't have much of a read on the button. Let's say he's pretty good. We both had about $400 to start the hand.