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Confidence Interval Calculator mean Compute a confidence interval for a mean from the sample mean, standard deviation and size. Sample […]

Linear Regression Calculator y = a + bx Fit a line of best fit by least squares: slope, intercept, R²

Variance Calculator s² & σ² Find the sample and population variance of any data set, with the standard deviation too.

Probability Calculator events Find the probability of a single event, or combine two events (AND, OR, neither). Single event Two

Median Calculator middle value Find the median (middle value) of any data set, plus quartiles and IQR. Enter your numbers

Mean Calculator average Find the mean (average) of any list of numbers, with the sum and count shown. Enter your

P-Value Calculator z & t Turn a z-score or t-score into a p-value for one- or two-tailed tests. Test statistic

Integral Calculator ∫ definite Compute the definite integral (area under f(x)) from a to b — numerically and reliably. Function

Derivative Calculator d/dx Differentiate any function and (optionally) evaluate the derivative at a point. Function f(x) Evaluate at x =

Z-Score Calculator + PERCENTILE Find the z-score, percentile and probability from a value & standard deviation — or straight from