Probability Calculator
Find the probability of two independent events: both, either, neither and exactly one.
100% free No signup Private & offline-ready Works in your browser
About the Probability Calculator
For two independent events A and B, see the chance that both happen, at least one happens, neither happens, or exactly one happens. Enter probabilities as decimals (0.25) or percentages (25).
Frequently asked questions
Is the Probability Calculator free?
Yes. The Probability Calculator on Apex Tool Station is 100% free with no signup and no watermark. Browser tools have no usage limits.
Are my files or data uploaded to a server?
No. Everything runs locally in your browser using JavaScript. Your files and text never leave your device, which makes it safe for private documents.
Does it work on mobile?
Yes. The tool works on any modern browser on Android, iPhone, Windows, Mac and Linux.