Probability Calculator

Calculate probabilities for single and combined events.

Calculator Mode

Event Outcomes

Favorable Outcomes

Number of ways the event can occur

Total Outcomes

Total number of possible outcomes

Probability Formulas

Single Event:

P(A) = favorable / total

Both Events (AND):

P(A ∩ B) = P(A) × P(B)

Either Event (OR):

P(A ∪ B) = P(A) + P(B) - P(A)×P(B)

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Probability Result

Probability0.3

Percentage30%

Odds3:7

Probability of NOT occurring0.7