Probability Calculator

Calculate probability of events with detailed explanations

Select Calculator Type

Choose the type of probability calculation

Calculator Type

Number of Favorable Outcomes

Total Number of Outcomes

Common Examples

About Probability

📊 What is Probability?

The likelihood of an event occurring, expressed as a number between 0 and 1.

🎯 Formula

P(E) = Favorable Outcomes / Total Outcomes

🔢 Range

0 (impossible) to 1 (certain)

Probability Rules

AND Rule (Independent)

P(A and B) = P(A) × P(B)

OR Rule

P(A or B) = P(A) + P(B) - P(A and B)

Complement Rule

P(not A) = 1 - P(A)

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