About the Binomial Distribution Calculator
Computes binomial probabilities from n and p, with a full distribution chart.
What it is
Enter n and p, choose exactly/at-most/at-least/between, and get the probability computed via the exact binomial PMF using a log-space Lanczos gamma function for numerical stability, alongside the mean, variance, and standard deviation.
Features
Four query types
Exactly, at most, at least, and between k1/k2.
Full PMF chart
Bar chart of every outcome, with the queried region highlighted.
Mean/variance/SD
Computed alongside every probability.
Exact combinatorics
Log-space computation avoids precision loss for larger n.