Probability of At Least One Calculator - Free, Instant, In Your Browser
Enter the probability of the event on a single trial and the number of trials to calculate the chance it happens at least once.
How to use Probability Of At Least One Calculator
- 1Enter the required date(s) and details above.
- 2Click Calculate - Probability Of At Least One Calculator runs instantly, right in your browser.
- 3Read your result below.
Your file is processed in your browser and is never uploaded.
Frequently Asked Questions
What's the formula?
P(at least one) = 1 - (1 - p)^n - the complement of the probability that it never happens.
Is my data sent to a server?
No - everything runs entirely in your browser with JavaScript. Nothing is uploaded.