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🎲 Probability Calculator
Calculation Type
P(A and B) - Both events occur
P(A or B) - Either event occurs
P(not A) - Complementary event
P(A|B) - Conditional probability
Probability of Event A (P(A))
Enter value between 0 and 1 (e.g. 0.5 for 50%)
Probability of Event B (P(B))
Probability of A and B (P(A∩B))
Event Relationship
Independent Events
Mutually Exclusive Events
General (Not Independent/Exclusive)
Precision (decimal places)
Show Calculation Formula
Calculate Probability
Result
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Formula Used:
Quick Examples:
P(A and B) (ind)
P(A or B) (excl)
P(not A)
P(A|B)
Notes:
Independent events: P(A and B) = P(A) × P(B)
Mutually exclusive events: P(A or B) = P(A) + P(B), P(A and B) = 0
General events: P(A or B) = P(A) + P(B) - P(A and B)
Conditional probability: P(A|B) = P(A∩B) / P(B)
Complementary probability: P(not A) = 1 - P(A)
Probability values range from 0 (impossible) to 1 (certain)