Probability Calculator
Calculate single event probability, combined events (A or B, A and B), and complements.
Calculate
%
Enter as percentage (0-100)
Visualization
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P(A)
0 %
Probability of event A occurring
P(A)
50%
P(not A)
0%
P(A or B)
0%
P(A and B)
0%
Other Formats
Decimal
0
Odds (for)
—
1 in X
—
Documentation
Probability Rules
Probability quantifies uncertainty. Values range from 0 (impossible) to 1 (certain). Combined probabilities depend on whether events are independent or mutually exclusive.
Complement
Union
Independent
Frequently Asked Questions
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