Probability Distribution Calculators

Use this normal distribution calculator to compute interval probabilities, percentiles, and tail probabilities with interactive PDF and CDF charts.

Calculate exact binomial probabilities and cumulative values with an interactive PMF/CDF view for n and p.

Compute Poisson probabilities for event counts per interval using lambda with PMF and CDF visualization.

Calculate probabilities and quantiles for the standard normal distribution (mean 0, std 1) with z-score interpretation.

Convert probabilities to percentile cutoffs for a normal distribution and interpret percentile thresholds with interactive charts.

Calculate probabilities, critical values, and quantiles for the Student t distribution with interactive PDF and CDF charts.

Compute chi-squared probabilities, critical values, and p-values for goodness-of-fit and independence tests with interactive charts.

Calculate exponential distribution probabilities, mean time between events, and survival probabilities with interactive visualization.

Compute gamma distribution probabilities and quantiles for waiting times, Bayesian priors, and reliability analysis with interactive charts.

Calculate beta distribution probabilities for proportions, rates, and Bayesian priors with interactive PDF and CDF visualization.

Compute Weibull distribution probabilities, failure rates, and reliability metrics with interactive survival and hazard visualization.

Calculate F distribution probabilities, critical values, and p-values for ANOVA and variance ratio tests with interactive charts.

Calculate uniform distribution probabilities for continuous and discrete uniform variables with interactive PDF and CDF charts.