Probability Calculator

Probability = Favorable ÷ Total Outcomes. Range: 0 (impossible) to 1 (certain). Rolling a 3 on a die: 1/6 = 16.67%. Independent events: P(A and B) = P(A) × P(B). P(A or B) here is for mutually exclusive events, which cannot happen together: P(A) + P(B). For overlapping events, P(A or B) = P(A) + P(B) − P(A and B), which needs the overlap and is not computed here.