๐Binomial Distribution Calculator
Find exact, at-most, at-least, and between-range probabilities from n and p.
Runs entirely in your browser. No data is sent to a server.
Free Binomial Distribution Calculator
Need to find the probability of a specific number of successes in repeated trials? Our free binomial distribution calculator computes exact, at-most, at-least, and between-range probabilities instantly from your number of trials and success probability.
Enter n and p, choose your query type, and get the probability along with the mean, variance, and standard deviation of the distribution. A full bar chart plots every possible outcome, with the region matching your query highlighted, so you can see where your result sits in the overall distribution โ not just a single number in isolation.
Built for probability and statistics coursework, quality-control problems, and anyone modeling repeated yes/no trials. Every formula is shown with your values substituted in. Free, no sign-up, no limits. See the About page or the FAQ for more.