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Probability Calculator
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Probability P(A)
0.3000
30.00%
Complement P(A')
0.7000
70.00%
Odds For
3:7
Odds Against
7:3
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Four probability modes: basic outcomes, compound P(A AND/OR B), Bayes theorem for conditional probability, and normal distribution z-scores and percentiles.
How to Use
- 1Select a tab: Basic, Compound, Conditional, or Normal Distribution
- 2Basic: enter favorable outcomes and total outcomes to see probability and complement
- 3Compound: enter P(A) and P(B) to see P(A AND B) and P(A OR B)
- 4Conditional: enter P(A∩B) and P(B) to find P(A|B), and apply Bayes' theorem to reverse it
- 5Normal Distribution: enter mean, standard deviation, and X values to find probabilities and z-scores
Features
- 4 modes: Basic, Compound, Conditional/Bayes, Normal Distribution
- P(A AND B) and P(A OR B) for independent and mutually exclusive events
- Bayes' theorem P(A|B) with reverse P(B|A)
- Normal distribution: z-score, P(X<x), P(X>x), P(x1<X<x2)
- Dice/coin probability distribution table
- 100% browser-based
Frequently Asked Questions
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