Probability Calculator
Probability, complement and odds from favorable over total outcomes.
How it works
P = favorable ÷ total
E.g. rolling a 6 on a die: 1/6 ≈ 0.167. Favorable cannot exceed total.
Worked example
One fair die:
- Even:
3/6 = 50% - Two sixes in two rolls:
(1/6)² = 1/36 ≈ 2.78% - At least one six in two rolls:
1 − (5/6)² ≈ 30.6%
Notes and limitations
Independent events multiply; for "at least one", use the complement (1 − none). Only mutually exclusive events add.