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Probability Calculator: Chance & Likelihood

Calculate the probability of a single event occurring.

What is Probability?

Probability is a branch of mathematics dealing with the likelihood of an event occurring. It is expressed as a number between 0 (impossible) and 1 (certain), or as a percentage between 0% and 100%.

The Formula

  1. Formula: P(A) = n(A) / n(S)
  2. Where n(A) is the number of favorable outcomes and n(S) is the total number of possible outcomes.
  3. Example: Rolling a '3' on a die. There is 1 favorable outcome and 6 total outcomes. P(3) = 1/6 ≈ 16.7%.

Probability FAQs

What is the difference between odds and probability?

Probability is the ratio of favorable outcomes to the *total* outcomes. Odds are the ratio of favorable outcomes to *unfavorable* outcomes.