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Distributions and plots calculators 🔔 calculators
Explore 6 free distributions and plots calculators 🔔 calculators. Calculate in your browser with clear inputs, worked examples, and transparent methods.
6 calculators available
- Exponential Waiting-Time Probabilities & Moments
Calculate exponential survival and cumulative probabilities, mean, median, variance and standard deviation from a constant event rate.
- Geometric Distribution: Failures Before First Success
Find the probability of exactly k failures before the first success, with the mean and spread of the failure count.
- Mean ± Sigma: Upper & Lower Control Limits
Calculate symmetric limits around a supplied mean using a nonnegative standard deviation and sigma multiplier.
- Pearson Chi-Square: One Cell’s Contribution
Calculate one observed-versus-expected count’s contribution to a Pearson chi-square statistic, with explicit inverse branches.
- Sample-Mean Expectation & Standard Error
Find the expected sample mean and its standard error for independent observations with a common finite mean and variance.
- Unrounded Equal-Class Width
Divide a numerical range into equal-width classes, retaining the unrounded width and compatible inverse values.