Statistics Calculators

Mean, median, mode, standard deviation and probability — worked out instantly with the steps shown. These calculators are built for students and analysts who need the answer and the working, not just a number. The basics cover mean, median and mode, variance, standard deviation, range and interquartile range, quartiles, percentiles and z-scores. Distribution tools cover the normal, binomial and Poisson distributions, plus a probability calculator and a p-value calculator. Tests include the t-test, chi-square, ANOVA, correlation coefficients and linear regression for comparing groups and finding relationships in data. Planning tools calculate confidence intervals, sample sizes and margins of error, so you can tell whether a survey result actually means something. There is also a coefficient of variation calculator, an outlier detector, a frequency table maker and a full descriptive statistics summary. Results are not just numbers: histogram, box plot, scatter plot, bar chart, pie chart and line graph makers turn a data set into a chart you can read at a glance. Everything runs entirely in your browser, which keeps your data private, and each calculator explains its formula in plain language so the working is never hidden.