Joint probability calculator
Enter probabilities as values from 0 to 1.
Branch probabilities
Bars show the calculated outcomes.
Calculation branches
| Event | Probability |
|---|---|
| Fill in the fields above — the result is computed on this page. | |
How do I use this page?
- Enter inputs.
- Check the branches and formula.
What this page does not do: The result assumes the supplied conditional probabilities are correct; repeated-trial mode assumes independence.
Further reading
Theory — what is the joint probability of several events?
This calculator works out the chance that several events all occur, based on their individual probabilities. Values are entered as decimals between 0 and 1, so 25% must be written as 0.25. It applies the multiplication rule, also using the complement of an event where needed, and displays every intermediate step of the calculation. This makes it clear how the final result is built rather than just showing a single number.
Frequently asked questions
Can I enter percentages?
See also
A/B test calculator
Compare two proportions in an A/B test. Calculate conversion rates, difference, uplift, z score, p value and c
A/B test planning — sample size, MDE and duration
Plan a two-proportion experiment, estimate detectable effect and traffic duration.
ACF and PACF autocorrelation calculator
Calculate ACF and PACF across time-series lags. Review the chart, reference bounds and coefficient table.