Probability Calculator: Chance and Odds

Probability: 0 (impossible) to 1 (certain).

Formula

P = Favorable / Total. Rolling 6: 1/6 ≈ 16.7%.

Key Rules

• Addition: P(A or B) = P(A)+P(B)-P(A and B)
• Multiplication: P(A and B) = P(A)×P(B) independent
• Complement: P(not A) = 1-P(A)

Odds

P/(1-P). 25% = odds 1:3.