Using the calculator
Enter the values requested above. Calculate event probability, complement probability and expected successes.
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Probability Calculator
Calculate event probability, complement probability and expected successes.
Enter the values for the problem
Enter the numbers, equation values, scores, or dimensions requested by the probability tool. Review the supporting outputs to check the result and understand the relationship between the values.
Important: Use the inputs that match your situation. Results are estimates based on the values and assumptions entered.
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How to use this calculator
Reading the result
The result shows event probability, complement probability and expected successes.
How it is calculated
For equally likely outcomes, event probability is favorable outcomes divided by total possible outcomes. The complement is one minus that probability, and expected successes multiply probability by the number of trials.
Results are estimates based on the values entered. Review the Methodology and Calculator Disclaimer for important limitations.