4/2 Method for Calculating Odds

Overview
When there are two cards left to come, multiply your outs by 4. When there is one card left to come, multiply your outs by two.

For example: After the flop with two cards to come (turn and river) multiply your outs by 4.

If you have two outs, you have roughly an 8% (2 * 4 = 8) chance of making your hand

For example: After the turn with one card to come (River) multiply your outs by 2.

If you have 2 outs, you have roughly a 4% (2 * 2 = 4) chance of making your hand.

While the 4/2 method is not exact, it will get you close enough to the true odds to make a decision on whether or not to continue playing a hand.

Hopefully these examples give you a better idea of how you can not only determine your outs, but also how to use that knowledge to improve your game.