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Independent-Events Probability Calculator

Calculate the probability of independent events occurring together or at least one occurring.

Your inputs

Your result

Enter your information and select Calculate to see the result.

How this calculator works

For independent events, AND multiplies probabilities; OR adds them then subtracts their product.

Change one assumption at a time to see which inputs have the greatest effect on the estimate.

Worked example

Two independent 50% events both occurring has probability 25%.

Limitations

This calculator is for educational use; verify important work independently.

Review this educational estimate against current quotes, official information, and your own budget before making a financial decision.