Quote Originally Posted by Fortune 500
If you've seen the flop, and there's two cards to come, multiply your outs by 4. That'll give you a very rough idea of your odds.
Also a little better for 2 cards is 4 * outs - (outs over 8). So your about 44-3 = 41% for 11 outs or 60-7=53 for 15 outs. Gets a little distorted past 8 outs w/o an adjustment. 8 outs or below just multiply by 4.