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Probability Calculator
Solve Probability with a transparent method.
Choose a probability modelProbabilities are entered as decimals from 0 to 1.
5 optionsPROBABILITY0.2
Probability of Two Events: Calculates two-event relationships, solves independent-event probabilities from any two known values, evaluates repeated independent events or exact binomial successes, and finds normal-distribution interval probability.
- Probability of A: P(A)
- 0.4
- Probability of B: P(B)
- 0.5
- Probability of A NOT occurring: P(A′)
- 0.6
- Probability of B NOT occurring: P(B′)
- 0.5
- Probability of A and B both occurring: P(A∩B)
- 0.2
- Probability that A or B or both occur: P(A∪B)
- 0.7
- Probability that A or B occurs but not both: P(A△B)
- 0.5
- Probability of neither A nor B occurring
- 0.3
Formula checkedCalculates two-event relationships, solves independent-event probabilities from any two known values, evaluates repeated independent events or exact binomial successes, and finds normal-distribution interval probability.