Most of these calculators display odds according to your poker hands order. Thus the odds of having straights, full houses, flushes etc are predicted as well as your opponent's poker hands and associated odds are dealt with. All acquired statistics are combined to get an estimate of a win in a percentage.
You should choose a poker table properly. Your choice should depend upon the type of poker game you want to play, the betting limits of the table, and what kind of players are on the table. To win, it is best to play with amateurs rather than compete with professionals.