Everyday tool
Probability Calculator
Enter P(A), P(B) and P(A and B) as decimals from 0 to 1.
Runs in your browser. No upload.
Values are processed locally in this browser.
Result
About this tool
Probability Calculator made simple.
The calculator uses the event probabilities you provide. It does not assume independence; enter the intersection probability explicitly.
Common questions
About Probability Calculator.
How do I use Probability calculator?
Enter P(A), P(B) and P(A and B) as decimals from 0 to 1.
Is my data uploaded to a server?
No. This tool runs locally in your browser. Your input is not uploaded.