Math & Calculators•Free & Browser-Based
Probability Calculator
Calculate single event probabilities, complementary events, independent event intersections (A AND B), and unions (A OR B).
Mean (Average)21.67
Median22.00
Mode25
Sample Std Dev (s)5.98
Total Count: 9
Sum: 195
Min: 12
Max: 30
Variance: 35.75
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What is the Free Online Probability Calculator?
Probability quantifies the likelihood of an event occurring, expressed as a number between 0 (impossible) and 1 (certain).
100% Client-Side Privacy: Calculations and data processing occur entirely in your local browser memory. Zero files or personal inputs are uploaded to our servers.
How to Use Probability Calculator Online: Step-by-Step Guide
- 1For single event: enter favorable outcomes and total possible outcomes.
- 2For compound events: enter Probability of A and Probability of B to calculate $P(A \cap B)$ and $P(A \cup B)$.
Mathematical Formula & Underlying Logic
P(E) = \frac{\text{Favorable Outcomes}}{\text{Total Outcomes}}
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