At least one of two independent events
Statistics / FREE CALCULATOR
Find the chance that at least one independent event occurs.
Your answer starts here.
Enter your values and select Calculate to see the result and any available breakdown.
How to use this calculator
- Enter first event probability. Use the unit shown beside the field.
- Enter second event probability. Use the unit shown beside the field.
- Select Calculate and review the result. Select Reset to restore the example inputs.
How the calculation works
1-(1-First event probability)*(1-Second event probability)
Worked example
First event probability = 0.5; Second event probability = 0.2. Result: 0.6 probability.
Understand your result
Find the chance that at least one independent event occurs. The result is expressed in probability.
Assumptions and limitations
Independence is required. Results are rounded for display.
Questions about this tool
What does this tool calculate?
Find the chance that at least one independent event occurs.
What should I check before using the answer?
Independence is required.
Related guides
Guides will appear here when published and linked by the editor.