Simple Probability of One Event

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Probability is the measure of how likely an event is to happen. For example, you can calculate the likelihood of getting certain poker hands or coin flips.

When dealing with equally likely events, you can calculate the probability of a certain event happening with the following formula:

Total Number of Ways Event can Happen
Total Number of Possible Outcomes

For example, what is the probability of getting heads when you flip a coin? There are 2 possible outcomes, and 1 of the 2 is heads, so there is a 1 in 2 (or 1/2) chance of getting heads. This is also called a 50% chance, since 1/2 = 0.5 = 50%.


What is the probability of getting a 4 when you spin a fair 6-sided die?

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