Education & Math Tools
Probability Calculator
Enter favorable and total outcomes to calculate probability, plus combined AND/OR probability with a second event.
16.67%
P(A)
8.33%
P(A and B) — independent events
58.33%
P(A or B)
How to use this tool
- 1Enter favorable and total outcomes for event A.
- 2Enter the probability of event B.
- 3See P(A), P(A and B), and P(A or B).
Frequently asked questions
Does this assume independent events?+
Yes — the AND/OR calculations assume events A and B are statistically independent.