Probability Calculator
Calculate probability, odds, and chances for single and combined events.
Select Calculator Type
Choose the type of probability calculation
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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