Probability Calculator

Math Calculators

Calculate the likelihood of events happening.

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Result (%)

About This Tool

Simple probability calculator for single events. Find the probability of an outcome based on the number of favorable outcomes and total possibilities.

Frequently Asked Questions

Probability is the branch of mathematics concerning numerical descriptions of how likely an event is to occur.

Probability is calculated by dividing the number of favorable outcomes by the total number of possible outcomes.

A probability of 1 (or 100%) means the event is certain to happen.

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