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About the Probability Calculator
This calculator computes the probability of single or combined events using combinations, permutations, and probability distributions. You enter your values and get the probability as a decimal or percentage.
For combinations it applies the standard formula C(n, r) = n factorial divided by (r factorial times the factorial of n minus r). For distributions it uses the binomial formula with sample size n, success probability p, and number of successes k. Inputs include total outcomes, favorable outcomes, and the success probability. Check that your events are independent before using the binomial mode.
- Select a calculation type, such as combination, permutation, or distribution.
- Enter the total number of outcomes, sample size, and success probability.
- Read the probability shown as a decimal or percentage.