Probability Calculator
Probability of an event from favorable and total outcomes.
Worth Knowing
This computes classical probability as favorable outcomes divided by total equally-likely outcomes, giving a value between 0 (impossible) and 1 (certain). The 'equally likely' assumption is crucial and often violated in the real world — a loaded die or a biased coin breaks it. Also remember that probability describes long-run frequency, not short-term guarantees: a fair coin landing heads five times running has no memory, and the sixth flip is still an even bet.
How to Use
- Enter Favorable outcomes into the first field of the Probability Calculator.
- Fill in the rest: Total outcomes.
- Your result appears instantly as you type — there's no submit button or page reload.