Three Events Probability Calculator

How to Calculate Probability of Multiple Events

When calculating the probability of three different events occurring, you use the following:

• The percent chance all three events occur.


• The percent chance that 2 or more of the events will occur.


• The percent chance that 1 or more of the events will occur.


• The percent chance that none of the 3 events will occur.

Knowing this information can be useful, so we hope this provides you with the more in-depth look that you were looking for.

Calculating All 3 Events Occurring

Multiply the individual probabilities together after converting them into decimal form. For example, if Event 1 is 50%, Event 2 is 40%, and Event 3 is 15%, the calculation is: (50 / 100) * (40 / 100) * (15 / 100).

Calculating None of the Events Occurring

Use the formula: (1 - Event 1 Probability) * (1 - Event 2 Probability) * (1 - Event 3 Probability).

How to Use the Three Event Probability Tool

This is a very simple and easy-to-use calculator. Follow these steps:

1. Enter the percent chance of event 1 occurring (0-100).


2. Enter the percent chance of event 2 occurring (0-100).


3. Enter the percent chance of event 3 occurring (0-100).


4. Click calculate to instantly get your results.

Calculation Example

If Event 1 has a 50% chance, Event 2 has a 40% chance, and Event 3 has a 15% chance, you can use the calculator to determine:

• Percent chance of all three events occurring: 3%.


• Percent chance of 2 or more events occurring: 27.50%.


• Percent chance of 1 or more events occurring: 74.50%.


• Percent chance that none of the events occur: 25.50%.