Probability Calculator
Calculate probabilities, combinations, permutations and more with our advanced probability calculator
Input Parameters
Calculation Results
Probability of A OR B (Union)
0.00
P(A ∪ B) = P(A) + P(B) - P(A ∩ B)
Probability of A AND B (Intersection)
0.00
P(A ∩ B) = P(A) × P(B) for independent events
Complement of A (Not A)
0.00
P(A') = 1 - P(A)
Conditional Probability (A given B)
0.00
P(A|B) = P(A ∩ B) / P(B)
Key Probability Formulas:
• Union: P(A ∪ B) = P(A) + P(B) - P(A ∩ B)
• Intersection: P(A ∩ B) = P(A) × P(B|A)
• Complement: P(A') = 1 - P(A)
• Conditional: P(A|B) = P(A ∩ B) / P(B)
• Union: P(A ∪ B) = P(A) + P(B) - P(A ∩ B)
• Intersection: P(A ∩ B) = P(A) × P(B|A)
• Complement: P(A') = 1 - P(A)
• Conditional: P(A|B) = P(A ∩ B) / P(B)
★★★★★
"This probability calculator saved me hours of manual calculations for my statistics course. The explanations and formulas make it easy to understand the concepts."
- Sarah J., Data Science Student