Texas Hold 'em Probability Calculator
Click "edit" on a card to assign a value to that card. Cards with no value assigned are treated as being face down with unknown values.
Approximate chances are displayed below the cards. The chances are calculated on the fly by simply simulating thousands of games. Win/lose/tie chances and expected return assume that no player folds. Figures in green are accurate to within ±1 percentage point with 95% confidence.* [Edit March 2016: I recommend ignoring the statistical claims on this page.]
*Specifically, for the chances, 0.95 is the nominal coverage probability of an Agresti-Coull interval with boundaries within 1 percentage point of the rounded estimate. For the expected return, 0.95 is again the coverage probability of a confidence interval with boundaries within 1 percentage point of the rounded estimate; this time, the confidence interval is constructed by assuming a normal distribution because I don't know how to calculate anything better. (Can anybody help me with the math?)