The last thing you want to do is calculate in your head at the table. Forget about the shortcuts and just memorize them. There really aren't that many numbers to memorize and you will know them off the top of your head in no time flat.
First: You don't need to know anything above 9 outs. If you have more than 9 outs to a lock, the pot will almost always offer you the proper odds.
Second: Only memorize the odds for the next card to come. The odds for two cards to come are very misleading because you have to assume you'll be seeing BOTH the turn AND the river and the board can change dramatically when the turn is revealed.
The difference between the odds for the next card on the flop and the next card on the turn are miniscule. Forget about the difference between the two and just memorize the odds for the next card to come on the turn.
Pretty soon, you'll just know that a flush draw is 4.1 to 1.
I googled "poker odds chart" and came up with
this.
Good luck!
Onaflag..........