σStatistics Calculators
Free statistics calculators with formula steps and charts — for students, researchers, and data analysts. No signup required.
Calculate population and sample standard deviation with full step-by-step working, plus mean, variance, and more from your data set.
Paste a data set and get all descriptive statistics plus a histogram.
Convert between a z-score and a percentile with a shaded bell curve.
Calculate confidence intervals with the margin of error formula shown.
Run one-sample, two-sample or paired t-tests and get the p-value.
Find p-values from z, t, chi-square or F statistics with a shaded distribution.
Calculate AND, OR and conditional probabilities using Bayes' theorem.
Calculate nPr and nCr with step-by-step factorial working.
Find probabilities and plot the full binomial distribution.
Find the area under the normal curve between any two values.
Calculate Pearson's r from two data sets with a scatter plot.
Find the best-fit line equation and R² for your data.
Run goodness-of-fit and independence tests with observed vs expected tables.
Find Q1, Q2, Q3, IQR and outliers with a box-and-whisker diagram.
Calculate Poisson probabilities and plot the distribution.
About these statistics calculators
These statistics tools show the formula, the calculation, and the result — so you understand what happened, not just what the number is. Paste a data set and instantly get mean, median, mode, standard deviation, and a histogram. Run a t-test and see the test statistic, degrees of freedom, and p-value alongside the shaded distribution curve.
Every tool runs entirely in your browser with no signup required. From basic descriptive statistics to hypothesis testing, regression analysis, and probability distributions — these calculators handle the computation so you can focus on the interpretation.