Math calculators
Probability Calculator
Enter probabilities between 0 and 1 for two independent events to get AND and OR results.
P(A and B)
0.15
P(A or B)
0.65
How to use
- Enter P(A) and P(B) as decimals from 0 to 1.
- Read P(A and B) and P(A or B).
- Keep events independent for these formulas.
Features
- Independent AND / OR
- Decimal probability inputs
- Clear results
Privacy & how it works
This calculator runs entirely in your browser with JavaScript. Your inputs are not uploaded to ToolsWeb servers for this tool. Privacy Policy · Disclaimer.
FAQ
What about dependent events?expand_more
These formulas assume independence. Dependent events need conditional probability.
Is this calculator free?expand_more
Yes. No signup required.
Are my numbers uploaded?expand_more
No. Calculations run in your browser. Inputs are not sent to ToolsWeb servers for this tool.
Is this professional advice?expand_more
No. Results are estimates for general information. See our Disclaimer for health, finance, and related tools.