About Probability
Probability measures the likelihood of an event occurring and ranges from 0 (impossible) to 1 (certain). It is widely used in statistics, science, finance, and everyday decision-making.
How This Calculator Works
You can calculate probabilities for a single event, the chance that two events happen together (AND), the chance that at least one event happens (OR), or the complement of an event (NOT A).
Formulas Used
Single: P(A)
AND: P(A) × P(B)
OR: P(A) + P(B) − P(A)×P(B)
Complement: 1 − P(A)
Practical Advice
Always ensure probabilities are realistic and between 0 and 1. This tool assumes events are independent when using AND and OR calculations.
FAQs
Can I use percentages? Yes, values above 1 are treated as percentages.
Are dependent events supported? This calculator assumes independence.
Is this exact? Results are mathematically accurate based on the input.
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