This probability math calculator, helps to find the probability of a given event to happen.
Result
Your result will appear here...
How to use:
- Single Event: Calculate probability of a single event (P = favorable/total)
- Multiple Events: Calculate combined probability of two events (AND/OR)
- Conditional: Calculate conditional probability (P(A|B) or P(B|A))
- Enter the required values and click "Calculate Probability"
- Use "Show Example" to load sample values
Formulas:
- Single Event: P = favorable outcomes / total outcomes
- AND Probability: P(A and B) = P(A) × P(B)
- OR Probability: P(A or B) = P(A) + P(B) - P(A and B)
- Conditional: P(A|B) = P(A and B) / P(B)
Examples:
- Single: 3 favorable out of 6 → 0.5 (50%)
- Multiple: P(A)=0.5 AND P(B)=0.5 → 0.25 (25%)
- Conditional: P(A)=0.3, P(B)=0.4 → P(A|B)=0.75