Probability & Distribution
This hub hosts online probability and distribution calculators. They are designed to help you calculate probabilities and analyze key statistical distributions. Specifically, you’ll find calculators for finding probabilities using normal, binomial, Poisson, hypergeometric, exponential, and other distributions.
The calculators also provide step-by-step explanations to help you learn how to solve different probability problems.
Try these tools, and you’ll find probability and statistical modeling easier to master.
Calculate binomial probabilities using the number of trials, probability of success, and selected number of outcomes.
Find conditional probability to measure the chance of one event occurring given that another event has happened.
Calculate Poisson probabilities for rare events occurring over time, space, distance, or other fixed intervals.
Calculate the z score of a value using the mean and standard deviation to measure distance from the average.
Find the probability linked to a z score and interpret areas under the normal distribution quickly.
Calculate the area between two z scores to find probability within a selected normal distribution range.
Find the area to the right of a z score to calculate upper-tail probability under the normal distribution.
Find the area to the left of a z score to calculate lower-tail probability under the normal distribution.
Convert a percentile into a z score to locate its position on the standard normal distribution.
Find the z score or cutoff value that matches a given probability or percentile in a normal distribution.