Party Poker
No Limit Holdem Ring game
Blinds: $0.10/$0.25
5 players
Converter

Stack sizes:
UTG: $35.62
Hero: $25
Button: $9.85
SB: $23.15
BB: $35.83

Pre-flop: (5 players) Hero is CO with 4 4
UTG raises to $0.75, Hero calls, Button calls, SB calls, BB folds.

Flop: A J 4 ($3.25, 4 players)
SB bets $2, UTG calls, Hero raises to $9...

Thoughts on raise size? I'm trying to figure out how to determine the perfect raise size for these situations.