03 tools · 3 live
Statistics Calculators
Mean, median, standard deviation, probability, and data analysis tools.
Statistics is the smallest category on the site — just two tools, both inferential: the confidence interval calculator and the t-test calculator. If you're looking for descriptive statistics instead — mean, median, mode, standard deviation, range — those live in the Math category; this one is reserved specifically for hypothesis-testing tools.
Both tools here answer a version of the same question: how confident can you be that a pattern in your sample data reflects something real, rather than random noise?
Confidence Interval
LiveCalculate a confidence interval for a population mean (Z or t-distribution) or a proportion (Wald and Wilson) at any confidence level.
T-Test
LivePerform a Student's t-test (independent, paired, or one-sample) with exact p-value, t-statistic, and degrees of freedom.
Chi-Square Test
LiveRun a chi-square goodness-of-fit or independence test on your own data — get the statistic, degrees of freedom, and p-value instantly.