Probability Calculator Probability Calculator Calculate probability, combinations, permutations, odds, and related values. Select Calculation Basic Probability Complement Probability Conditional Probability Probability of A or B Probability of A and B Binomial Probability Combination (nCr) Permutation (nPr) Probability from Odds Probability from Odds Against Favorable Outcomes Total Possible Outcomes Probability of Event P(A) P(A and B) P(B) P(A) P(B) P(A and B) P(A) P(B given A) Number of Trials (n) Number of Successes (k) Probability of Success (p) n r n r Favorable Odds Unfavorable Odds Odds Against Calculate Clear Print Probability Result Calculation Result Percentage Decimal Explanation: Last 50 Calculations Clear History SearchSearch