Study & learning
Probability Distribution Calculator
Pick a distribution and get the shaded probability or the critical value, no tables needed.
Preparing tool
How to use Probability Distribution Calculator
- Choose the distribution and enter its settings (mean and spread, trials and chance, rate, or degrees of freedom).
- Choose Probability to find an area, or Critical value to find the cut-off for a tail area such as 0.05.
- Read the answer, see it shaded on the chart and follow the working.
What are the limits of Probability Distribution Calculator?
Computed in double precision with standard numerical methods (about 12 correct digits). Discrete cut-offs are whole numbers, so the tail area reached can be a little below what you asked for; the tool shows the exact area. Binomial n is limited to 1,000,000. Nothing you enter leaves your device.