Pot Odds Question

I am slightly confused on calculating ones odds to hit an out with one and two cards to come. I have seen them calculated in different ways- one way treats both streets eparately and the other way tries to incporporate ones estimate of how much one might have to bet on the next street into the calculations. Has any one seen calcuation like these or have I just massively misunderstood and it is really just a question of taking a street by street approach?

In casse you have been wondering, I have been taking the odds on a street by street basis, unless I am all in.

I may not be understanding your question but your odds to hit an out are never going to be altered by a bet size. If you're simply trying to calculate your odds to hit an out: "there is a shortcut that makes it much easier to calculate odds: After you find the number of outs you have, multiply by 4 and you will get a close estimate to the percentage of hitting that hand from the Flop. Multiply by 2 instead to get a percentage estimate from the Turn. You can see these figures for yourself below"

The part in quotes is from: http://www.tightpoker.com/poker_odds.html

velutha is correct. Your odds will never change from a bet. I believe what you are talking about is combining a couple things. The odds are always the same regardless of a bet, but you will have to pay more to see them if you aren't all in. For example, if you have TcTd on a flop of 3dKs4h, and your opp. has kc2c you have two outs, the other two tens. Your odds of catching one by the river is ~2*4=8 and by the turn its' ~2*2=4. So if you go All in right now (which is not a great play obviously) you will get to see both streets for the same price. if on the other hand you call a raise, you will still have to call another raise on the turn to see the river. So if you are getting the right odds if you get to see both cards, you may have to make another call on the turn which will mean you aren't getting the right odds to make the call. I hope that made sense

Some hands will require the bigger -till the river - thinking, and some can be street by street.